Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b369d7af5d9a02…

MALICIOUS

PDF

41.4 KB Created: 2020-11-01 05:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c481c476a1a1caedbab8e4cbd4a3354 SHA-1: 544faaf2c5efd63375f7bdb4519de51ea71e580c SHA-256: 80b369d7af5d9a02c7dc54a27c2b5bd326e42d9221bc7f878b5bed6616ad35d1
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, masquerading as a poetry collection, which redirect to potentially malicious or SEO-spam content. The primary malicious link identified is https://cctraff.ru/wb?keyword=afrikaans%20gedigte%20pdf, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the assessment of a link-farming or redirection attack.

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://cctraff.ru/wb?keyword=afrikaans%20gedigte%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f919a3cb1adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f884c3f1cb40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8a6e6002626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9d4da2f28c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f9a0d5a2f8f7.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/4137779.pdfIn PDF document text
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/6678639.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/14f9e600-4111-4fd1-a272-6f2ee020759c/38405791886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682588dc-1fc5-43e1-9919-066ff9972c66/pathfinder_shield_bash_damage.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/xotapogojovabobuwef.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/37516758505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1ce01b-cfdc-4670-930d-597dd0bf6edb/74953129997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd1d0d1-9c91-421f-a13b-9d12897a1214/red_dead_redemption_2_leather_working_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf36b4d3-7ea6-4da0-9187-5fda622f35c1/figiraninoti.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/jajitodidukomidimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a30cb75-fffa-479b-bf15-82f6f71b8a5b/vemufoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b140c60e-8893-46f4-9a89-cf13d50aa3c5/star_trek_into_darkness_2013_dual_au.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_off00006317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 5232 bytes
SHA-256: 2db41e280d37184452dbcf34da5751d849e2c6b732eae8d9e1cd687c34186f40
font_01_sfnt_off000074fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10564 bytes
SHA-256: f40342a41d7d09e1f3adab27e56fddde2d2b384c975365113f36113dcdec72a3

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