Did you encounter this link on a or receive it in a message ? Providing the context can help identify the exact type of threat.
If you have already downloaded it, do not open it . Delete the file immediately and empty your trash. Download Pay 20857 mp4
If the site hosting the file suddenly claims your computer is "infected with 17 viruses," it is a classic social engineering tactic to make you download their malicious "fix." Safety Recommendations Did you encounter this link on a or receive it in a message
Ensure "File Name Extensions" are visible in your system settings. A file named Pay_20857.mp4.exe is a common trick used to hide malware. Delete the file immediately and empty your trash
Clicking a link for this "mp4" will likely trigger a series of redirects to sites claiming you need to "update your player" or "verify you are human" by downloading an executable file.
If a site forces you through three or more different URLs before showing a "Download" button, it is likely harvesting your IP address and browser data for ad fraud.