These are often used as "chain mail" to spread fear among younger users. If you are looking for the "lore":
The filename refers to a notorious "shock" or "cursed" video that gained viral infamy in the late 2010s. It is essentially an Internet urban legend and an example of a "screamer" or psychological horror video. What is 12474049.mp4? 12474049.mp4
Like many videos of this era, it usually concludes with a loud noise and a flashing, terrifying image meant to startle the viewer. These are often used as "chain mail" to