Strange 404s

I was just checking the 404s on a couple of my CS-Cart sites and came across these - anyone recognise what these could be?



/pysknjclsvy.html

/mpryrfrfhbepmju.html

/dkyryppvk.html

/oohpzdjikyjdn.html

/abolkdkyvfbfya.html

/hyeffthzrisdl.html

I’ve never seen them before. What’s the content ?

Just spammers really