Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c99ffe5422d497…

MALICIOUS

PDF

39.5 KB Created: 2020-11-08 00:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e6fe9366d166f1850dde5df78a6f33db SHA-1: 2d56e7ac1c9474d534b5e7ea299958679fc6abf2 SHA-256: 82c99ffe5422d4975e4218dc61615d957e55c320389cfa12dcf7306c2be7ed48
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://ggtraff.ru/123?keyword=2016+nol+carryover+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f970b1915a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5f9d5d2cc13bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f90cb5e49449.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/abf7257efc49.pdfIn PDF document text
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/mubeju-bavud-pakonevasesu.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/5637707.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/81c6d55c1488956.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/054c25bd5.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/1894000.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/2dd9b4f3-fb14-486e-b848-b2eb843c7e06/5519665009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9831eae-e1c2-4567-8e40-8c3eba37b89e/vufup.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.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_off00005af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 5588 bytes
SHA-256: 1907f69d141b1f580bbd8a070c7d10d27f4f538ace7fbe6e54a6e7c02ae80010
font_01_sfnt_off00006e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E19 10220 bytes
SHA-256: aa56dc4a3f54ab649fb416701119853708d24aea8941d52342c93b328c1a6c4a

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