Why is Android Central automatically downloading a file called "usnc" to my Mac?

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AC Question

Every time I visit a page, go to a new page or refresh a page a file called "usnc" gets downloaded to my Mac. Why is this and what is the file?
 
Got this file downloaded, but only after whitelisting it in my ad blocker.
With adblocker enabled, no file is downloaded.

My guess is it has something to do with ads. Still weird though.
Not very reassuring to keep adblocker off.