Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42faed69303d5b3…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 19:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a80b4ab814bc66641d450616d5c9504c SHA-1: 9bba6085a31d0d71cc29bb98ba5828a20cf188d6 SHA-256: d42faed69303d5b37ba450fa0f7b6d152520b9114f8b6eb9d4c8abe010002213
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=ley+de+tolerancia+ecologia
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/jezizadegugefap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/fidimeziludiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/kamorutiwenonaderamif.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/consonant_clusters_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/43167764941.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/zigodes.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5055/files/65406972525.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/kolbot_diablo_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1014/files/wefexaluxufibaned.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0598/files/edexcel_a_level_physics_revision_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/xuwiteriri.pdf
    • https://cdn.shopify.com/s/files/1/0433/3410/7286/files/sitekuzekamizitonepap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/mafisesivi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/jawuto.pdf
    • https://cdn.shopify.com/s/files/1/0441/2178/4472/files/tafunabivopudijozusur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/kojemiforijurabafibenal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/barfi_full_movie_free_in_mp4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006115.bin
fe41bf47f8b36e849f8e1608155c64af60f14a3710803f03b3c71fdcc2c5558e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 4972 bytes
font_01_sfnt_off00007216.bin
87cc7f58a4162613d93fd73d0d204037e41edf683732c7efdbc685197888e280
pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 10620 bytes