Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae1943a8ca52c7b…

MALICIOUS

PDF

137.6 KB Created: 2020-08-11 17:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16af109f2b7d943fc4b6887692e41b93 SHA-1: e6d589183a12cfc55400839a1270f13a8377d99f SHA-256: aae1943a8ca52c7b4aba4683202336da1cfbd63d6d7651c0bb53a73abbab44cf
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a free download for 'Ayn Rand Anthem free pdf', which redirects to a malicious URL (ttraff.cc). This URL is identified as a known malicious redirector. The document also hosts a large number of other PDF links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ayn+rand+anthem+free+pdf
    • http://files.elfiesrefuge.net/uploads/1/3/1/3/131383771/77dbaed666d4a51.pdf
    • http://files.nashvilledebateleague.org/uploads/1/3/0/9/130969421/4400798.pdf
    • http://files.vintagepariscoffeeshop.com/uploads/1/3/1/3/131398164/medejuzofefaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/pezegikakumatuwagodibefe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/80784696324.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/disable_adobe_genuine_software_integrity_service_mac.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/rupuxuwubanigefajej.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/rolijiba.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/voxitol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/68292286577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kamunikizesow.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/audi_a4_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/cfot_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/83145966739.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/90371183803.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d43a.bin
c81eaa4a0309fc0ecd9450760a5d5a8384cbd3e3e3af77c72cda4ef7424ad9f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D43A 4792 bytes
font_01_sfnt_off0001e447.bin
4272a1a374ac05e75ba2595ef06d3e0e64ee7efedeb61ed6344e512e37d82f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E447 11096 bytes
font_02_sfnt_off00020a21.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A21 4324 bytes

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