Right-click the file and look at "Properties" (Windows) or "Get Info" (Mac). You can often see the exact time it was saved or the device that originally filmed it.
Search your WhatsApp chat history for "Nov 26, 2018." The conversation surrounding the video usually provides the "why" and "who" that the filename hides. 2. Creative "Restoration" VID-20181126-WA0013mp4
If you found this file in a random folder you don't recognize, run a quick scan with your antivirus. Old media files are occasionally used to mask script exploits in shared folders. Right-click the file and look at "Properties" (Windows)