Vital signs of unfamiliar software are present in safe mode: TopBuzz in Galaxy Note8

In **Device Maintenance** system app on Samsung Galaxy Note8, there is a **TopBuzz** cache shown when caches are being cleaned . **Also in the safe mode.** It reappears as a cleanup item every few minutes together with **System cache** item and they show 82 MB to clean up. Since nothing like that is installed, I originally thought this is a sign of a malware, but after rebooting to the safe mode, the behavior continues and both items are re-appearing every few minutes in 82 MB size. **Is *TopBuzz* normal part of Note8 built-in software or is it possible that it somehow got into the phone later? How can I determine what is happening here?** Additional details: * The phone is not rooted. * Android 8.0.0. * 5 anti-virus scanners did not find any issue with **TopBuzz**. * I reviewed the entire app list in the safe mode and found nothing like that. * Despite the name on the above screenshot, I did not find a public or hidden cache called TopBuzz using *SD Maid* app. Any other caches shown by *SD Maid* contain only few kilobytes after cleanup, 82 MB is nowhere to be found. But TopBuzz + System cache still show that 82 MB size in Device Maintenance app. --- Update: Samsung support replied me that "TopBuzz is not a part of their device".