Malicious PDF — malware analysis report

Static analysis result for SHA-256 f088f2509d2d6fbd…

MALICIOUS

PDF

39.4 KB Created: 2020-11-07 23:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ca8d39419883002a16030364561cca SHA-1: 15101ea9ab8dfc635f3bc42d3070b906977ecc18 SHA-256: f088f2509d2d6fbde9604d1ab9f4d363b6122e506ca1d042013a70c6fb023521
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to known malicious redirectors and a link farm, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple external PDF links suggests a tactic to distribute or host malicious content across various domains.

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/123?keyword=vienna+grade+school+55
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/wanirelakamiwuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874d4c07171.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f95854615511.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/vebobin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b37a6556-8585-4b01-b2a1-2f439818ac70/94058991390.pdf
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdf
    • https://selogum.files.wordpress.com/2020/11/40721308403.pdf
    • https://fudatagito.files.wordpress.com/2020/11/introduction_to_probability_and_statistics_mendenhall_14th.pdf
    • https://tukenazi.files.wordpress.com/2020/11/xazalubixizixanuvoj.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_off0000570e.bin
57b070ac0d6f794fbc66ad8d0436662efa7356b55e271143ff30d97201d260d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570E 5288 bytes
font_01_sfnt_off00006911.bin
5a3bfaac3facd466529a80a3aa003a563f99458d4354dd4125403726ed91ceb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 12356 bytes

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