https://www.justice.gov/opa/press-release/file/1367701/download
Both this bitcoin address, as well as the email allegedly belongs to JON CHANG HYOK, one of the North Korean military hackers indicted by the US Department of Justice, who was involved a critical ransomware infrastructure attack. The same bitcoin address was present in numerous emails sent from tony.walker@outlook.kr, to attempt to extort money from a company that has decided to remain anonymous, but has a market cap of over 200B+ USD.