Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa036cbed29e09…

MALICIOUS

PDF

47.6 KB Created: 2020-07-31 13:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76ff225d018b98bbf53827af70f0e3a7 SHA-1: 94352f9c3d63807553f967a974b419e209685242 SHA-256: 17fa036cbed29e09c4f9681cc86e4c827398a4cd1311022022f6ac7c1a3a6fa3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it hosts a large number of external PDF links, many of which are generated with numeric slugs, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=alimentation+%25C3%25A9quilibr%25C3%25A9e+pdf
    • http://files.wellesleypops.org/uploads/1/3/0/8/130874317/xefemiluge.pdf
    • http://files.michaelroldham.com/uploads/1/3/1/8/131872021/f9867.pdf
    • http://files.edgewaterinnandriversidegrill.com/uploads/1/3/1/4/131406108/3115847.pdf
    • http://files.canadaimmigration-lawyer.com/uploads/1/3/1/6/131636697/sevujafajupaveteduxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/vofazugupilije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/filiwivetefizaludato.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/ruxezuxijuzis.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/29934884716.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6924/files/39758478398.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/39839312853.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/4839994877.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/gulukovisebewegulijimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/42450305780.pdf
    • https://cdn.shopify.com/s/files/1/0433/3712/1951/files/zupaxaratunutukenale.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c8.bin
431a5eb11418375bf3bc887160be05bc6fdc928e8a270407b60808a484f1e46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 5288 bytes
font_01_sfnt_off00008951.bin
f4a5ecfb37b4bc691434a1464e25df445c8a49504e8ca2492e8c5a38fcaffaf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8951 12272 bytes

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