Obviously a canard
Apart from poor grammar, the scammers are complete idiots - even if someone can believe that placing their own email address in From/Reply-To can mean the mail account has been compromised, it really makes no sense sending the same pathetic junk to the same addresses over and over again. Especially several times a day. "What?! Three hackers have hacked into my system and placed their own malware?!"
The geography of senders is various; I suppose there are several spammers networks/botnets used - I see Brazil, Japan, China, Germany... etc etc etc. No country-specific influx, and I have over 12 email addresses being targeted.
If anyone wishes to have that collection of sextortion senders IPs and/or Bitcoin addresses they include, just let me know.