Malicious PDF — malware analysis report

Static analysis result for SHA-256 3702f7ca348e133b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-11 17:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2950000a65eaf32cff14d5b0911f549 SHA-1: 4e8ba5196a2aae2c073dc6e729ed727dc220fe79 SHA-256: 3702f7ca348e133b0ca78755a14f02a8d358b1bcf929f28f27b7a5d28974b403
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body and embedded artifacts reveal a large number of external links, many pointing to PDF files on various domains, consistent with a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=apa+style+paper+example+pdf, which likely serves as the entry point for further malicious activity.

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=apa+style+paper+example+pdf
    • http://files.kerryanemonahan.com/uploads/1/3/1/4/131407977/tubor_xalejoxuk.pdf
    • http://files.thejambalayashoppe.com/uploads/1/3/1/8/131856158/7470373.pdf
    • http://files.lastwatchhorology.com/uploads/1/3/1/1/131164556/daxololo-dixavawagozu-povuwu.pdf
    • http://sizot.guideconcept.ch/uploads/1/3/1/3/131384169/3c56d87ef476611.pdf
    • https://cdn.shopify.com/s/files/1/0431/8455/4135/files/aoac_official_methods_of_food_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/67069563647.pdf
    • https://cdn.shopify.com/s/files/1/0428/6418/1404/files/42520385970.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/tutusulujajabuxe.pdf
    • https://cdn.shopify.com/s/files/1/0441/2276/7512/files/complete_pet_cambridge_vk.pdf
    • https://cdn.shopify.com/s/files/1/0435/1636/2904/files/58548498822.pdf
    • https://cdn.shopify.com/s/files/1/0437/1002/1787/files/lunisibamevita.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0850/files/lakusegefenixilajawovodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxajuvorupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/zeruripexiluwimejifuz.pdf
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/definition_of_financial_globalization.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_off00006b78.bin
20c6aa7f3e58c75ee6cbbac8a4cd98e1f02ed4af9795efa8022157eba4cb89a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B78 5348 bytes
font_01_sfnt_off00007d9e.bin
59770d42dd6c0889355e3ef26e9950d5ac80c59df7cc45150fe9daa732d60e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9E 9976 bytes

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