Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f63b6ad657787dc…

MALICIOUS

PDF

40.7 KB Created: 2020-10-07 10:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5d11ac67ef09b42c447888628e29014 SHA-1: 63f538a23ed78bb4d6f09de9e72ce508f01958ae SHA-256: 3f63b6ad657787dc66722ccbf502cccd62563efe0bf6717ebc2fd001f564244e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as search results, directing users to potentially malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a clear intent to redirect users to external, likely malicious, sites. 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://ggtraff.ru/strik?keyword=hoover+carpet+cleaner+instruction+manuals In PDF document text
    • http://bikanilix.pacificrimfoundation.org/uploads/1/3/1/4/131437208/kadebogi-febegus.pdfIn PDF document text
    • http://files.mmsdesigner.com/uploads/1/3/0/7/130739087/434545.pdfIn PDF document text
    • http://rijijepob.lvcchp.org/uploads/1/3/0/9/130969497/e8ad6d83f.pdfIn PDF document text
    • http://files.tornadoalleychasing.com/uploads/1/3/1/8/131856330/jewatazuvazus.pdfIn PDF document text
    • http://files.marismakeovers.com/uploads/1/3/1/3/131379820/33747bb0aa7db1c.pdfIn PDF document text
    • http://files.shoanlo.net/uploads/1/3/0/7/130775265/finafofuzabago_bojirabas.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/ee6dd6b2-d75e-40cd-89b1-aa81b2240c27/37067063011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a507233-d337-40d5-ac3f-b50097da0242/somizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df1e8df-acef-4d63-9ad9-03bc1e055f21/67193350978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c642b8-5be4-4271-9250-5c03de0068f7/81587494849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b140d1-c93c-4692-a628-dde097195b25/29682699782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e37d9b-66b9-4667-88b2-d2f54346f731/52254707580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ab3a1a-e268-4e88-95d9-056545fa7825/nujetufesejuwulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117111cc-88e8-42b3-8965-9258de8145dc/66275023739.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_off00006205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 5100 bytes
SHA-256: 5070767e43cb9078c85bcc1efd87bf56da76da86b86eabb061824c9406c9291d
font_01_sfnt_off0000734e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734E 10176 bytes
SHA-256: 3adec775a922f2b76b329c1737e967457b595450b11217316e615f9251c734bf

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