Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a5c8d057d7a2b1…

MALICIOUS

PDF

44.8 KB Created: 2020-08-19 04:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6b91256cc04dba9b0c581ed9038120 SHA-1: a71601036e58e90e39d4d598d5f5335732a122af SHA-256: 41a5c8d057d7a2b1e3f1cdcf2a3e875780d06ed07ad90e227a506272a5655992
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a British Museum tour. The document body and numerous embedded URLs, many pointing to Shopify domains with book-related slugs, suggest a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or redirection attack.

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=british+museum+free+guided+tour
    • http://files.tibetanbuddhismsatx.com/uploads/1/3/1/6/131606789/navuvadi.pdf
    • http://bavama.borrisns.com/uploads/1/3/0/9/130969060/tomumofipasirugun.pdf
    • http://files.fairdare.org/uploads/1/3/0/8/130873908/a99725247b86.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/advanced_algebra_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/sonofebideridupikike.pdf
    • https://cdn.shopify.com/s/files/1/0435/0928/5024/files/acc_cholesterol_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/rukuwisorukusugivototi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/16253783646.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/nonibokebupokenosetaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/baptism_of_the_holy_spirit_verses.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/business_analyst_training_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9959313526.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9849/files/88189731484.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6773/files/microbiology_culture_and_sensitivity_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/affixes_prefixes_and_suffixes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/13006383070.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_off000064aa.bin
fe5719506433a14df9af02560ec1f322a133e483309a3bf40a719c7d44f33d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AA 4904 bytes
font_01_sfnt_off0000755e.bin
3c10f88ac9e0ff3f1f229874f387ddb2991d13520a19aebf91fc98e5c428831f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 10216 bytes
font_02_sfnt_off0000984c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x984C 4324 bytes

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