Go to archive.org and paste the string into their internal search bar. If it’s a public historical file, it will show up there.
However, if you are trying to track down a specific or understand how these types of links work, What is an "Archive MP4" Link? archivefhdjuq986mp4 link
When you see a string of random characters followed by .mp4 , it usually indicates one of three things: Go to archive