Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b484ac9e798e003…

MALICIOUS

PDF

60.8 KB Created: 2020-08-12 03:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a7d77aea388ade3925bbdd42c9e67a6 SHA-1: e8809f4bae34cf9e92e18893a91ce35f1b377f38 SHA-256: 5b484ac9e798e00335547b46ecd5115145c164393ec1cec6e654893496270eb3
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to lure users to malicious sites under the guise of a "Game store black friday 2020 catalogue pdf". No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent.

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=game+store+black+friday+2020+catalogue+pdf
    • http://files.hazlehurstcentre.org/uploads/1/3/2/6/132681928/6f380d7.pdf
    • http://voxan.dealswithdessy.com/uploads/1/3/0/7/130739789/tezamokujalidilofa.pdf
    • http://files.jlsvalves.com/uploads/1/3/1/3/131380107/sopixawoxisaxabowegi.pdf
    • http://files.kidneycarecleveland.com/uploads/1/3/1/4/131453402/fuwiz_vogofaruzowig_xipeze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/gaxuvepurekarupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/catabolismo_dos_carboidratos.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/the_cost_of_discipleship_by_dietrich_bonhoeffer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/vinivovojovala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/jquery_to_vanilla_js.pdf
    • https://cdn.shopify.com/s/files/1/0429/3335/4659/files/jipapugonabinizan.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/nikenubumusa.pdf
    • https://cdn.shopify.com/s/files/1/0450/6117/7507/files/learning_objectives_and_learning_outcomes.pdf
    • https://cdn.shopify.com/s/files/1/0447/8078/1734/files/glass_blowing_tools_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/zoxowupivafedobudefufizo.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_off0000a123.bin
9c4a0535d858c493c245ff0faa44a35d122324a6e0ece7eca1eb8dc09a1968a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA123 6084 bytes
font_01_sfnt_off0000b5d3.bin
ff4d25236ea30341c0575e244397451b87418bb17227c50b1a03e411d84fd6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 15424 bytes

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