Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162e603d192ae73…

MALICIOUS

PDF

41.1 KB Created: 2020-11-04 05:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9658257a8d14c327242d97490666422e SHA-1: 773a1ae5481c2880d3d916621861fbbca774f571 SHA-256: 3162e603d192ae736033097a99ce72a8650701774a0c0b660d43355433f3ca9c
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains text related to 'Chromebook os download' and a URL that aligns with the heuristic firing for a malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=chromebook+os+download
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f929c4eaf19d.pdf
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/1940979.pdf
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8847dad57e0.pdf
    • https://bixanizutojez.weebly.com/uploads/1/3/4/4/134490846/pituludewulefetar.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/2163e316856aed9.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f883aea269c4.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/mavap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7f45a4f-fbe2-4c3c-8037-265c637b9b3f/66456224301.pdf
    • https://uploads.strikinglycdn.com/files/2d55d093-b2de-4c36-9850-56989fcf0b00/fuvilobidigafumujumu.pdf
    • https://uploads.strikinglycdn.com/files/49a07616-67c2-4138-ad9b-924505257b6c/45968385337.pdf
    • https://uploads.strikinglycdn.com/files/40cca73f-9029-447a-98b3-6f5851fd5b6a/zipozibagup.pdf
    • https://uploads.strikinglycdn.com/files/f3088595-5c95-403f-9a4b-fd5f47ae6f81/1935385544.pdf
    • https://uploads.strikinglycdn.com/files/74f96196-4bae-44f9-9174-d5ea16fb07a1/sulemolav.pdf
    • https://uploads.strikinglycdn.com/files/db072e0d-b066-483b-ac2b-f6743373d163/buxizabefizejunujokil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006128.bin
3ba12f2cfe8070d6049bfdfd3ffc2601ef252f2676d66ca7910216f520e5482d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 5264 bytes
font_01_sfnt_off000072e3.bin
a8b182f32fa9dc5ce0f61b7db8054b824d92883fa1f417e618f4de48a30c8172
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 10668 bytes