Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a61eb89458a9ddb…

MALICIOUS

PDF

40.2 KB Created: 2020-10-27 19:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f0b0b7e91540c9b3334327848b87d778 SHA-1: 12b9dadef43c4952756e623dd3ba7dbc9935168f SHA-256: 3a61eb89458a9ddb9d6549008b1cc3d3f3e4db53a8a2a85b6487af8fa71d5780
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=kiski+area+school+district+employment In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f8cc1213077c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5f8feddcae63e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f8dfa5f2d04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8713d546492.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/duderotudufexek-panasuwimegu-zujeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8aa36b8cea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f872da14ebbf.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/rirokudemesuz-tesib.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/veserejejuvaxikodula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f873f04d3065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f88bef96e2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5f983e2e81a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_5f93eb8655451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f974a1379dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404292/normal_5f9747166de62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f8b82196aaa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f87846f67323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f8d0e421867b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E65 5448 bytes
SHA-256: 83e9c962e5bdde024d39832afc4f2ee57a729edd9ed43c022dabfda2e7fafaa4
font_01_sfnt_off000070c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C4 10124 bytes
SHA-256: 5042e296ff3147560d6aefb4dfb0492a607a5fdbe2b5d886232695b245abec1a

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