Malicious PDF — malware analysis report

Static analysis result for SHA-256 36344b9ee02a1170…

MALICIOUS

PDF

45.3 KB Created: 2020-08-27 21:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33cb664377e28376fa5aa4966027a9e SHA-1: 371ceae94e7561ca18a5d21921bc32dba73e39f9 SHA-256: 36344b9ee02a11707509de1d7aa3dcee7b74211390ade4f43d0d5a239bde1362
152 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 identifying it as a redirector link to known malicious infrastructure. It also contains a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to artificially inflate search engine rankings or distribute content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=introduction+to+sociology+openstax, which is likely used to redirect users to a malicious site. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=introduction+to+sociology+openstax
    • http://rijumi.artisaninc.com/uploads/1/3/2/7/132740718/tesipomedum.pdf
    • http://files.prathleticboosterclub.com/uploads/1/3/1/4/131454620/f56346395c9.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4166/files/midiwevububivizigivafam.pdf
    • https://cdn.shopify.com/s/files/1/0437/7339/5101/files/xupibed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/91653883960.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/dometic_8500_awning_installation_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/rubepek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/define_collective_bargaining_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/3m_tape_catalog.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/
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000742c.bin
e001d88f719d2a16b42d6689f3c511a6569e08a0151759339dfc3f4f448e3450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 5348 bytes
font_01_sfnt_off00008672.bin
04d069200ccd938eb734b8e68acd0b58a2a6b1cf6b5a7138b163aa67c7dd5bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8672 9908 bytes

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