Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea30c869233c23a…

MALICIOUS

PDF

44.8 KB Created: 2020-07-28 21:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50c87ae5ea243976f1a1daaa54f639a SHA-1: 528c4439e75e84516e4b37cb19f3ca88086ffa06 SHA-256: 0ea30c869233c23a3bd2282620ff414e2b04161f76fdfe0415ef06eca6d7f36b
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. It also hosts a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute content. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent.

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=kyocera+duraxv+guide
    • http://files.teriannestanley.com/uploads/1/3/1/8/131856539/gutijimojitesuvofosa.pdf
    • http://files.seafom-friendsofmontessori.org/uploads/1/3/1/3/131379375/tatobuj-ranazulov.pdf
    • http://files.glendalelocalhistory.org/uploads/1/3/1/4/131406105/b7f27.pdf
    • http://files.forestvilleanglican.com/uploads/1/3/1/3/131381540/difajutuku-wuredarofewes-jusuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/nufevumuturivol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/51194222333.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/4854767574.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/42542376834.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/dilurasup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jamitaribigonekadori.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/69804372433.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/94346772807.pdf
    • https://cdn.shopify.com/s/files/1/0437/1221/7241/files/85479766558.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7440/files/17998935925.pdf
    • https://cdn.shopify.com/s/files/1/0440/3606/3397/files/govosumejupumalukadipegew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/70748938467.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_off000073d6.bin
3fd8950e6a45212c1397dd514781ebe7a8636394dccecd7d64e4873c5d7fa8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D6 4792 bytes
font_01_sfnt_off00008440.bin
9c532718f84f2a3a718a59c504fba41d6f1beddb6c43e0679d5dc3f923fa6bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8440 10100 bytes

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