Malicious PDF — malware analysis report

Static analysis result for SHA-256 141e07378e436ae9…

MALICIOUS

PDF

55.3 KB Created: 2020-08-31 16:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3763c857b2bcc42b821c8a57e1ee5e76 SHA-1: ca5f68658207743502b9ab24094a5b6002349a92 SHA-256: 141e07378e436ae9fba535d7189eb70e7034e0937ba33c232b77f8da401dedcb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, forming a link farm. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.ru/wix?keyword=kirov+class+guided+missile+cruiser
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/pilobefine.pdf
    • https://cdn.shopify.com/s/files/1/0456/5270/5447/files/80740339680.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/81047224961.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/8342866141.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/arduino_atmega328_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/4903/3384/files/driver_booster_7_pro_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/gaberira.pdf
    • https://cdn.shopify.com/s/files/1/0439/3625/2072/files/wudutolasafigobiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/70627872350.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/degradacion_fisica_del_suelo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3041/3475/files/8307527856.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/blueprints_neurology_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/viwijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/31020436781.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/84128816905.pdf
    • https://cdn.shopify.com/s/files/1/0437/6707/0877/files/financial_statement_analysis_project_report_mba.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/neet_2020_physics_syllabus.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_off0000918c.bin
9a06c08c03ec051e46303e963191830614879ed548ddd72d359d42d769fcaf52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x918C 5288 bytes
font_01_sfnt_off0000a37c.bin
3447cf0580705aa488463d833709e2b4596b22a3b6ba1726d95699fa43bb8cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA37C 14600 bytes

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