Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae91b1a7eb16b4be…

MALICIOUS

PDF

45.6 KB Created: 2020-11-05 08:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 399292b1273d47b59d7c1df0ed30a2d6 SHA-1: da904f5c6e094fd6cf687db838aaadd0e9769ef8 SHA-256: ae91b1a7eb16b4be8d718f012e07ee9670e73c5fa9d9b16668c5039076b8c25b
124 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=underemployment+rate+usa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f9942433ac1b.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/4216072.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/maxuvudoxanenej_noxenobiguvodin.pdfIn PDF document text
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/petufogasumabigaxowe.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/zimumadenosenebososa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8a40ba93584.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/kawuzu-ruximifureme-dufipamutod.pdfIn PDF document text
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/mapasexemelurixa.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/jupefujefazina.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/8aa357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b4b1be-c51e-4a48-bf82-4ebee69ad070/52031827357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ab48b7-df7d-483b-adc6-fe6206be285e/student_teaching_resume_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1aedce0-f783-4a3b-8ed6-0ea316763d29/98671738456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d11569b-141e-42fa-96f2-eb4074dd5fec/pogunuwu.pdfIn 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_off00007585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 5200 bytes
SHA-256: 974b3a29246dbd66c265769b44e30bae3335a708b2a0d8a6183e40df14d12ae1
font_01_sfnt_off00008721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8721 10024 bytes
SHA-256: 998527a5557ecae1940654f68342cad36f37349caed68137615afc7e56adc823

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