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Ensure it actually ends in .mp4 . If it ends in .zip, .exe, or .dmg , it is almost certainly a virus.

In this case, the file isn't a specific "viral" video, but rather just the fourth clip a user saved from the platform during a single session. 2. Clickbait and Social Engineering OnlyFans(4).mp4

Because "OnlyFans" is a high-traffic keyword, bad actors often use generic file names like OnlyFans(4).mp4 to lure users into clicking links or downloading files. Ensure it actually ends in

This indicates that there are at least three other files named "OnlyFans.mp4" already sitting in your Downloads folder . OnlyFans(4).mp4

Use a tool like VirusTotal to scan the URL or file before opening it.