Facebook video link Virus

Have a few friends that have clicked on fake video links, then their Facebook account starts to spam friends with similar links.

What is it this "virus" does really, exept spamming friends with similar links ?

And how to remove it from their Facebook accounts ?

Is it a app in their Facebook, or some infection in their web browser ?

Need advices to help them.

Looks like this (screenshot)
http://prntscr.com/gbzayy
 

Edited by pcproffsen, 23 August 2017 - 04:02 AM.

I wrote about this malware (adware) on my website (in hungarian): https://makay.net/hacker/facebook_messenger_virus_video_adware.html

As I see this is an unsolicited (hidden) Google Chrome extension that sends itself over Facebook messages and redirects to advertising websites. So you should check the browser extensions at first.

Ok, whats the name of the extension ?

So its embeded in a PDF ?

You pressing the link redirects to a malicious page. Which in turn contains the extension that can hijack your facebooks friends list and posts messages to them. Basically, if you see a shortened URL or anything related to it, either skip or use Virus Total and Scan Url to scan the URL for potential malware.