You can try to download the Kies software for Mac. I could not fins an official download link from Samsung but I have found the below link from Softonic: http://samsung-kies.en.softonic.com/mac

Hi Marta, You will need to open the .SPB file using the Kies software from Samsung. You can download it for your Mac from the link below: http://www.samsung.com/in/support/usefulsoftware/KIES/JSP# Once you have KIES running, you can import the .SPB file and save it (convert it) as a .CSV or .VCF file that can be easily opened using third-party apps or transferred to your phone. If you are still having trouble with this, it would be a good idea to contact Samsung for additional tips and solutions. Good luck, James