Sush Bhabhi.mkv.mp4 -

The actual extension is what comes last (e.g., .mp4 or even a hidden .lnk or .exe ). By clicking it, you aren't just playing a video; you might be triggering a script or an executable. Why Is This Dangerous?

12 Types of Malware + Examples That You Should Know | CrowdStrike

Avoid downloading media from unverified links or "sketchy" websites. If a file name looks like a jumble of multiple extensions, it’s best to delete it immediately.

A double extension occurs when a file has two suffixes, such as .mkv.mp4 or .mp4.exe . This is designed to exploit a default setting in many operating systems—like Windows—that hides "known file extensions".

You see "Sush Bhabhi.mkv" and assume it’s a Matroska video.

The file might actually be an application or a shortcut ( .lnk ) that installs malware, keyloggers, or backdoors once opened.