Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ca6c40a884cadb…

MALICIOUS

PDF

39.9 KB Created: 2020-10-29 22:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0911a1a9af4a966ef398f210eb2c84d0 SHA-1: dfba68694bb494cf83633cb7517146fe9436a132 SHA-256: 93ca6c40a884cadbafd3fcb836072cf15474acfa3b0485092d5894684b68ee44
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://ggtraff.ru/strik?keyword=1+3+4+chrome+headers+sbc+shorty In PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/674c13c.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/zutogudupitolosuvire.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/bfd021aec9db6.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/tipiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f9a151c2c7b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f90d798b06b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f93ce960c3d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f88a2002482d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_5f98b02282eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86f98540800.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/3639528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f874917a0a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f8fbbaaa02bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8d6497ef515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8a67b192b44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A6 5232 bytes
SHA-256: 53096097826c7f6c4aa55035a333757fbb8193ad250c964521f06e6b82e5c092
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 10076 bytes
SHA-256: cac0ce072ad189562acbebe0042eed0393ae0b94dba12e17b419698d0e597060
font_02_sfnt_off000084a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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