Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c5563d2d02a6e…

MALICIOUS

PDF

40.4 KB Created: 2020-09-03 06:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 026f1661679ddd43fc0563cbeb0336b9 SHA-1: 2ecd3a3811ae1cd42cc7ad6f2679d2fbba61707c SHA-256: 128c5563d2d02a6ed12b7862d46ca57f22d1e32eaf4e0237b8b697a81bb4ba6a
174 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.club/wix?keyword=cdc+colorectal+cancer+screening+guidelines', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to CDC guidelines and the malicious URL, suggesting a lure for a phishing or scam operation. The presence of numerous other PDF links also indicates a link farm, potentially for SEO manipulation or to obscure the malicious destination.

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.club/wix?keyword=cdc+colorectal+cancer+screening+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ee4d88_6b834ad2dc67400fb966049e14d50a39.pdf
    • https://static.usrfiles.com/ugd/e8506d_fae7b030ae614ab88be3b41479eb353b.pdf
    • https://static.usrfiles.com/ugd/c1de29_09ff5fa830404e03995ef3694cf606b9.pdf
    • https://static.usrfiles.com/ugd/ce77c6_4869681eeabf492f93bc09bdffaa61d9.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/31423847271.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/design_and_analysis_of_algorithms_gate_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/netagesi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/silk_chocolate_almond_milk_nutritional_information.pdf
    • https://static.usrfiles.com/ugd/b8c837_068917eafbf94b3c9ea576201c468d35.pdf
    • https://static.usrfiles.com/ugd/b8c837_910e7a75e1584e87aaf707987ae68d13.pdf
    • https://cdn.shopify.com/s/files/1/0470/9197/4302/files/37692971713.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/mojewugasawurijelajej.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/formation_aviculture_tropicale.pdf
    • https://cdn.shopify.com/s/files/1/0440/2718/3269/files/alister_mcgrath_libros.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_off000060a5.bin
b8b14f915eb85eb77e6319251894ddbeb77f6b0e1e599a3dccc3b1cdc0343107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 5012 bytes
font_01_sfnt_off000071b4.bin
51e5c303d1575beabfd42034907066ac535455d03c80c8f0b57fe2112491ce17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 10236 bytes

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