Malware/Trojan . This is often not a real video file but an executable disguised with a .mp4 extension or a file designed to exploit vulnerabilities in outdated media players. Behavior:
If you have already interacted with the file, run a full system scan using a reputable security suite:
The link is often sent with "clickbait" titles to provoke curiosity.
If you have received this file or a link to it, delete it immediately without clicking or downloading.