df1 = gpd.read_file('shapefile1.shp')
df2 = gpd.read_file('shapefile2.shp')

df1['attribute1_of_shp2'] = 0
df1['attribute2_of_shp2'] = 0
for feature in df2.itertuples():
    geom = getattr(feature, 'geometry')
    attr1 = getattr(feature, 'attribute1')
    attr2 = getattr(feature, 'attribute2')
    intersection = df1['geometry'].intersection(geom)
    df1['RelIntersection'] = intersection.area/df1.area
    df1.loc[df['RelIntersection'] > .75, 'attribute1_of_shp2'] = attr1
    df1.loc[df['RelIntersection'] > .75, 'attribute2_of_shp2'] = attr2