The song consists of 4 chords arranged in two riffs
i don't know the picking pattern, so i'll just give the chords

(riff 1)

e---9---7---5(occasionally slides to 7)--0--|
b---7---5---3----------------------------2--|
g---6---6---4----------------------------2--|
d---7---6---4----------------------------2--|
a-------------------------------------------|
e-------------------------------------------|

(riff 2)

e--5/7--0--|
b--3----2--|
g--4----2--|
d--4----2--|
a----------|
e----------|