Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14d37be2e2ea86f…

MALICIOUS

PDF

39.7 KB Created: 2020-07-27 13:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b48962a98c031809fd1c3c394e1052a SHA-1: 3061f9e87b67f89e6bb18dcb70305df01b7fe547 SHA-256: c14d37be2e2ea86fe82d65439c03e09e23eab89efb89f5a1203396dc3ce75cbc
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic firing for a malicious redirector link. This link, 'https://ttraff.cc/pify?keyword=callan+method+stage+7+pdf', is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The presence of numerous external PDF links, many pointing to Shopify, further indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the final destination.

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/pify?keyword=callan+method+stage+7+pdf
    • http://files.enactyourfuture.com/uploads/1/3/1/1/131164067/popowowexu-xujewofa-dutewodono.pdf
    • http://files.mrlibutti.com/uploads/1/3/0/8/130814232/newosujiverifa-susove-lulupe-wipavumojukoga.pdf
    • http://files.rodanthesurfshop.com/uploads/1/3/2/6/132696155/kilema.pdf
    • http://files.enactyourfuture.com/uploads/1/3/1/1/131164067/popowowe
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/40105176806.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/94375974129.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/papadigaworavozamom.pdf
    • https://cdn.shopify.com/s/files/1/0436/2321/9363/files/vebakolukuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1212/0998/files/78117379834.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/mipidenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/fetobopomorozijar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/77412062241.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/mejejigijuwopowajidapiza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/71426450424.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/pagalazokarorupujuzibi.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_off00005f85.bin
bc7b559ebeb85c02b2f26ee24ece1c80fcc5f77708c079eccf25f10c4bbbbbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 5200 bytes
font_01_sfnt_off0000711f.bin
f9a01d99ee1a2aff8a9e9c47201c97488b06438c33b3f9c316fda1d9124b8b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 9624 bytes

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