This domain is registered on namecheap and for sale there.
You can go to https://sedo.com/search/details/?language=e&origin=partner&partnerid=322307&currency=USD&domain=coinbrasil.com

And submit your offer, it will find its way to a different email that the owner of this domain checks.
I checked publicly available information, this domain has been registered long time ago and likely the owner will never check that email again. Person saying it doesn't have any social media sites. There is one twitter account from Venezuela which is also inactive.
But it looks like the owner is a domain flipper so he for sure checks his email registered with namecheap.