How to remove Pdfhelp virus and restore encrypted files

Ransomware virus example

Pdfhelp ransomware already infected many laptops in many countries via most effective manner: scam e-mails with dangerous attachments. Also, fraudsters use exploits to infect the system, but big program vendors quickly fix them. When infection is done, the virus examines the computer memory, defines the quantity of folders to be cyphered and their approximate price. Currently, any new ransomware is able to encrypt text, audio, image and video files in all known formats. Ransomware encrypts all files, but the ones that might be business correspondence go first. Pdfhelp targets only information, and doesn't affect the software, so that the user can pay the ransom through an infected computer. Encryption is made through well-known AES and RSA algorithms, and its complexity is so above the average level that it cannot be bruteforced. Such complexity gives foundation for such an incredible effectuality of ransomware in last years: common PC operator, even if he has a fairly high knowledge of the computer, won't ever recover the data, and will have no choice except paying the ransom. The single manner to restore the information is to find the fraudster's site and obtain the master key. Also there's a chance to obtain encryption keys through defects in viruse's program code.

This entry is dedicated to virus called Pdfhelp which gets onto customers' PC around the world, and encrypts the files. In this item you can find complete information about Pdfhelp's essence, and how to remove Pdfhelp from the computer. Furthermore, we'll teach you how to get back the cyphered information and is it possible.

There is one common feature for all kinds of ransomware: it's much simpler to prevent it than to cure it. Unfortunately, 90% of customers realize the significance of computer knowledge just after ransomware infection. To protect your workstation, you should keep in mind a three simple rules:

    • Be careful with the e-mails that contain data. The #1 template of fraud letters is the story about prize winning or parcel receiving. The #2 effective sort of such letters is a forgery for biz correspondence. It is natural to be interested and read the letter even if it's sent to the incorrect address, but don't forget that one click on the attached file might cost you a lot of time, headache and money.
    • Don't ignore the red flags that your computer displays. It requires much of hardware power to encrypt the information. If you notice a sudden decrease in workstation capacity or detect a unwanted string in the Process Manager, you can switch off the workstation, launch it in safe mode, and scan for viruses. These measures, if the PC is really infected, will guard a lot of your information.
    • Heed to the pop-up windows. One of the most efficient manners of data restoration is the restoration through Shadow Copies, and the creators of viruses have added the removal of shadow copies in the primary functionality of ransomware. However deletion of copies needs admin rights and operator's verification. Thus, not confirming alterations from a strange software at the right moment, you will reserve the opportunity to restore all corrupted information free of charge.

You should know that the removal of Pdfhelp is only the, first move, which is required for the regular work of the machine. To recover the data you should follow the tips in the next chapter of this entry. In case of ransomware we don't publish the hand uninstall tips, because its complexity and the probability of errors will be very high for average user. We don't suggest trying to uninstall the virus manually, because it has various defensive features that can counteract you. Some malware are able to easily remove cyphered information, or some of it, when trying to delete the virus. To avoid this, abide to the guide below.

Removal instruction

Step 1. Boot into Safe mode

Safe mode

Start -> Msconfig.exe

Safe mode. Step 1

On the tab Boot select Safe boot

Safe mode. Step 2

Step 2. Check Startup folder

Start -> Msconfig.exe ->Disable unknown programs in the Startup tab


Step 3. Check hosts file

Modify hosts file, that located in C:\Windows\System32\drivers\etc\ .

Hosts file.Step 1

Open the file with Notepad and delete suspicious strings.

Hosts file.Step 2

It has to look like this:

Hosts file.Step 3

Step 4. Scan the system with antiviral scanner

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Step 5. Disable Safe mode

Start -> Msconfig.exe ->Disable Safe boot in the Boot tab

Deactivate Safe mode

After deleting Pdfhelp from the PC, user has to restore the corrupted information. In fact, this is not literally decipherment, since the encrypting algorithms owned by scammers are very complex. There are the lucky chances, but usually file recovery requires plenty of time and efforts. If you can't linger and are willing to get back the information by hand - here's the complete article on that topic.

To restore information, follow the article about files decryption.

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