Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8149b4aa5f45e8…

MALICIOUS

PDF

36.3 KB Created: 2020-08-13 16:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b62a5f94e37723d0f630b89718a64d SHA-1: 65592d0bbd341062a6d47071e1d8d44c61d91d5f SHA-256: 8f8149b4aa5f45e8f5d082dcfae784734d243b61943b173326782073bdab498b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. Additionally, it features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates a phishing or content distribution lure.

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.cc/wb?keyword=catalogue%20dahua%20pdf
    • http://files.nuyounutrition.com/uploads/1/3/1/4/131453615/mawimapane-levujetefuf-pijezuzikike-padik.pdf
    • http://vewobif.culturalcouncil.org/uploads/1/3/2/8/132816202/1735556.pdf
    • http://files.warfish.co.nz/uploads/1/3/0/9/130969761/gagubuzafelixiban.pdf
    • http://files.nidoforest.com/uploads/1/3/1/0/131071067/8fcdc9976fb254d.pdf
    • http://files.garfinkelseruya.com/uploads/1/3/1/4/131453512/zigunamopof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9154/9590/files/drugstore_cowboy_james_fogle.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3507/files/durability_of_construction_materials.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/56384234910.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/30191381738.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/garman_forgue_companion_website.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/xawakojitoxuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1829/files/asfixia_libro_alex_mirez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/parowetuwaxiniriri.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/tupawuregizaralipipofikaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/vafup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/podawesawaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/magia_cabalistica.pdf
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/gmat_og_2015.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_off0000502e.bin
c856e9ff2433b2456ee2007118c0f7b5a3fe46029c44d7b2115646dea9c6be87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x502E 4936 bytes
font_01_sfnt_off000060f8.bin
1b80adc775c884f8012138b95865533453e0ba469117e1628ee3df12dd7d7e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 10608 bytes

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