// hook woocommerce_single_variation?
add_action( 'woocommerce_single_variation', 'custom_attributes', 10 );

function custom_attributes(){global $product;

if ( get_post_type( $post ) === 'product' && ! is_a($product, 'WC_Product') ) {
    $product = wc_get_product( get_the_id() ); // Get the WC_Product Object
}

$product_attributes = $product->get_attributes(); // Get the product attributes

// Raw output
echo '<pre>'; print_r( $product_attributes ); echo '</pre>';}

// Get custom product attributes
https://stackoverflow.com/questions/13374883/get-custom-product-attributes-in-woocommerce