It doesn't matter where you get bitcoins, they are not limited to locales. As long as you have them, you can pay the ransom to the attackers.
Be very careful though.
There are scammers and thieves that take advantage of your sense of urgency and your lack of experience. There are many places on the internet that will promise that you'll get bitcoins in exchange for payment, and then after you send payment they'll just disappear without ever ending you any bitcoins.
Make sure that wherever you are getting the bitcoins from is a reliable source.