A standard high-definition video should be several hundred megabytes (MB) or gigabytes (GB). If a "movie" file is only 2KB or 5MB, it is likely a script or a virus, not a video.
Sometimes the video is real, but when you open it, your player says, "Missing Codec. Click here to download." That "codec" is often malware designed to give a hacker remote access to your computer.
A malicious file might actually be named Sexy Girl (2870).mp4.exe . If your computer is set to "hide extensions for known file types," you only see the .mp4 , but clicking it executes a program instead of playing a video.
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