Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c4e87d1df8fce…

MALICIOUS

PDF

38.2 KB Created: 2020-10-02 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 308ce3cd9334a5004f55ae7367c08a4b SHA-1: ec4970946b775b71b26638b936727d5cb1deb7a3 SHA-256: 998c4e87d1df8fce983868b011569a177b983b19d8a16b5c1e40e9832d63c5fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is likely part of an SEO spam or link farm operation designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=airbrushing+models+for+beginners+pdf In PDF document text
    • https://site-1039409.mozfiles.com/files/1039409/dagibazodowi.pdfIn PDF document text
    • https://site-1039351.mozfiles.com/files/1039351/97895178264.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/43884240595.pdfIn PDF document text
    • http://mukona.bayareaflightinstruction.com/uploads/1/3/0/9/130969690/zakadogamov.pdfIn PDF document text
    • http://kabefami.jameswestdavidson.com/uploads/1/3/1/8/131871991/lolunemozanoguxo.pdfIn PDF document text
    • http://files.viajaangelica.com/uploads/1/3/1/4/131452952/kotumisudutiniv_divased_sigetuxukatesu_puzevowodan.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
    • https://uploads.strikinglycdn.com/files/73160884-0c2b-4bb1-ac2d-69ae70b788e9/wopaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b85a19-ae4e-4ba1-9a21-c206f971938e/nonejajunidemunage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d68f93f-2f48-4c26-b9bc-9747535bd6cc/65922868561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8fea29-be65-4971-8d00-dac852f2954c/31411526053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a831dc2b-e82c-4742-b79f-8d20c8aa5fde/doxavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a272c9-301d-4c3a-8fa0-50934485f6cb/bubufuvutotagirigamub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9D 5176 bytes
SHA-256: d0453c5810be05420f7687cfe0bb12dc9ceabb98d5f6e4885f541dc3f0b2a5ae
font_01_sfnt_off00005bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF3 9864 bytes
SHA-256: b04db056d7d989f642170a1819eaaf11f1414c6782382d6fbcbb51ac04eff191
font_02_sfnt_off00007dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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