Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fda66631e719a05…

MALICIOUS

PDF

68.3 KB Created: 2020-11-24 10:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f2e6d13bcb674a966e15b27b6512d77b SHA-1: 187556853638f7cab978f63945dea883cb1b8fc0 SHA-256: 4fda66631e719a05bcb7f4b14f587f5c7dad909fa7c0d1b9ce197f9e8322772d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure and a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=ciaat+brava+21+printer In PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/8107816.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/wofurureruruk-sukelezidumotaw-bolekaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/tifamageritatifiwunef.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/lisa_page_transcript_of_testimony.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/fake_money_transfer_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/majix.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/online_quiz_system_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84480acc-993a-42b2-99c1-0cc11c93e4c7/.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/19953008396.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/wutuwubi.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/block_story_unlimited_diamonds_apk.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_off0000d008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD008 4892 bytes
SHA-256: 358c2a379175d41953278b26b1eabd4c8f11f4a7b5a259a984f126199287e320
font_01_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 10684 bytes
SHA-256: 93c5f502f0461e37683fdf7a1157cbf5483646b1a456b09776c5c42260a28acd

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