Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cff35d163f06267…

MALICIOUS

PDF

37.7 KB Created: 2020-08-07 23:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 186f233d9777832119522bdb2f8a6765 SHA-1: 33bb1b970ca26d2f3986af1378d5b5300eba5bc4 SHA-256: 6cff35d163f06267e28dd98f3309f5845b0a01fd845b73c79846db1c67f96ac2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The embedded URLs, particularly the one pointing to 'ttraff.ru', are highly suspicious and likely serve as the primary mechanism for redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users.

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=amish+tripathi+books+in+malayalam+pdf
    • http://files.kayleesullivan.net/uploads/1/3/2/7/132710689/6283444.pdf
    • http://files.ghilliedhumusic.com/uploads/1/3/1/4/131453221/tidugonorotulisotud.pdf
    • http://files.thedailydelaney.com/uploads/1/3/1/4/131453251/xatimemabiw.pdf
    • http://files.peoriaregional.com/uploads/1/3/0/8/130874180/3187236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/jizeleto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/96011027399.pdf
    • https://cdn.shopify.com/s/files/1/0437/8610/9086/files/bowlby_attachment_styles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wabodenerevugibew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/kizesipexis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/45732674113.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/hibernate_reference.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/25853217564.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2080/files/29887158099.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/62352424654.pdf
    • https://cdn.shopify.com/s/files/1/0430/1586/4473/files/97_volkswagon_jetta.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_off00005462.bin
7ce815472f9f75e9021c7bda6fc24bf155f3eef1cec4ea04de029c53f87615af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5462 5576 bytes
font_01_sfnt_off00006731.bin
4735a0aa920b0a71993540535a3df79e8c470f6582e4abff748dea80a4a3c092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 9644 bytes

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