Write SQL query to solve given problem: Which type of weapon was used to attack the victim in the record number 031347-2015? What is the victim's race and gender?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.subject_weapon, T2.race, T2.gender FROM incidents AS T1 INNER JOIN subjects AS T2 ON T1.case_number = T2.case_number WHERE T1.case_number = '031347-2015'