Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4a69d49655cc5f…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26ea4b45cc422a41425f9511b63497e SHA-1: 1fb4495307d4d01d459d8f39462669bb4066bc34 SHA-256: cc4a69d49655cc5f23cc107d0b88732b408a6eab7a8e6d47d2d9255e6b919953
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic, which found 22 external PDF links. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure related to 'Acute traumatic spinal cord injury guidelines'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=acute+traumatic+spinal+cord+injury+guidelines
    • http://files.thefoqusgroup.net/uploads/1/3/2/7/132712040/5d29bef2fceac0.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/rudizifunimivegemadotet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/50662581381.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/55802539567.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/9094425705.pdf
    • https://cdn.shopify.com/s/files/1/0449/9701/7758/files/interview_questions_and_answers_for_english_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/representation_theory_of_finite_groups.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/65391280751.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/exercicios_de_geometria_angulos.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/28815622179.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/28751799068.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006672.bin
175d72597e9349d636f8c39203090fd7ef7c5de3d8eb5247e065ca2e2f0b2bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6672 5560 bytes
font_01_sfnt_off0000794b.bin
d47df039e09768c983def1791a7695a3dc3b3e473ab40d39eb240dbb6c2a414a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 10268 bytes

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