Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bb33cb50c21d6f…

MALICIOUS

PDF

50.0 KB Created: 2020-10-05 01:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80cec73301c4426d8cf95735c092a0db SHA-1: ea7ad772a53953cb552b0e7ad3a5a15dab04ca4a SHA-256: b8bb33cb50c21d6f94896792d6f42939aeea0dcf11672c339566cbf23f75f9fe
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a link farm designed to host other PDFs, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/strik?keyword=who+rules+the+world+pdf, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of SEO poisoning and redirection tactics.

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://ggtraff.ru/strik?keyword=who+rules+the+world+pdf In PDF document text
    • https://site-1040100.mozfiles.com/files/1040100/50134492185.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/91482216298.pdfIn PDF document text
    • https://site-1037867.mozfiles.com/files/1037867/25954371115.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/1431096938.pdfIn PDF document text
    • http://files.dumaynedesign.co.uk/uploads/1/3/1/3/131384335/wawewolonizima_xasololo.pdfIn PDF document text
    • http://xitiri.raveim.org/uploads/1/3/0/7/130739139/1196066.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/94c8ef96-0ebb-45e8-b131-31ea20f23524/39309591886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90d7281-152f-4e29-8202-266337057704/34763138885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661aae59-23af-4db1-8dbc-bf6cef6df1a4/xibesewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9157ff-f7d7-4074-b646-d96b76b26fb4/xefavusajoxeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d987540-2697-4cc8-b407-a1985ffb7227/6675652820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b862062a-5afc-4688-8b5a-ebe8d0d8a74c/wajalusukorubumogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e141c9dc-5b1a-4477-9492-0e22ab971132/tiragokenofosilejomavowat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47889e45-4017-4a49-b421-827fb2443a3d/lumelizesusafob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12378d9-3012-48df-a45b-6de436d14ded/gewej.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_off000086fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 5024 bytes
SHA-256: 666825999da1d8bd581e0807f8c37dae3ade5429a0625ddd07ad774d52ba2169
font_01_sfnt_off00009826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9826 10380 bytes
SHA-256: 6d23473bb8f281254fe897e4d29377fbdd1c9cd4e5e03d9eb124ddb7515606b1

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