Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c8c49bc77aa78…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 16:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78d858e965b38a5595405ef7326e4b07 SHA-1: a86c767b17dd198efc305335d87736d71c91f202 SHA-256: 680c8c49bc77aa7893aff22c6b04b2455ecbbb59a289b938a3aa684a70354f1f
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding of a redirector link to 'ttraff.ru' and a large number of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the redirector link found in the heuristics, indicating an attempt to lure the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=transmitting+form+t1013
    • http://files.thelowvisionstore.org/uploads/1/3/1/4/131438157/jigasujevufax_bekix_xidilo.pdf
    • http://files.markneeley.com/uploads/1/3/0/7/130775023/nevowefawunamudalag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4108/6888/files/82033001326.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3452/files/fuxade.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/pdf_sociologia_general.pdf
    • https://cdn.shopify.com/s/files/1/0431/9513/8208/files/linux_system_administrator_roles_and_responsibilities.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/93340271338.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/98861230249.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/gogopala.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/tigimejarabawolupiveri.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/definition_of_growth_and_development_in_psychology.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_off00007af3.bin
8d6d5eba18a3f5fa8d5bf81d281cd5f354434f74138b5443e37b048f4d300c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 5360 bytes
font_01_sfnt_off00008d12.bin
3a8f6612a2a299a018509e84745e50513c87741bd999f0c773243961c37a5ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D12 10076 bytes

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