Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b880217873221d0…

MALICIOUS

PDF

46.9 KB Created: 2020-10-06 16:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f7ab14b47e3cc924265efbdfa3215015 SHA-1: 236399ac1aebd5a1ae7ed069ebfd72490753ba91 SHA-256: 8b880217873221d0c36b5d2277c71c9340e8b02971bec9843dd04e6b648c92ce
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to drive traffic to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content, likely for SEO spam or phishing.

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=musculos+antagonistas+y+agonistas+de In PDF document text
    • http://sinob.greenleafcentral.com/uploads/1/3/0/7/130738799/706d6bf5066a2.pdfIn PDF document text
    • http://nemibuz.ostendmarineservices.com/uploads/1/3/0/7/130738836/913396.pdfIn PDF document text
    • http://xebipitul.whitelabelbridal.com/uploads/1/3/1/3/131379290/nuvojojetiwozake.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/55348807-5860-4117-a713-6a572cc7d2f5/telolazodux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e86f9b-a701-475a-9837-94522bd21db1/52698809970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469278e0-59d8-40d8-8b02-6cf72fe7b8a8/55661547337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516475c3-26ad-41d5-9b13-c1a1233802bc/18106813749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77a4f32-a2a2-43fb-9d61-5ebe3b5998b6/30761259146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3726f886-813d-4afc-a5b3-578e9b380f0c/46956293200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa10cae5-32dc-47f1-9574-e6e1a36a8286/92969143953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc1fbf2-9811-48fb-9734-3097518dff13/31552900646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34a1f2a-22c2-4c18-9fe8-ec3fd0449be7/27383953464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd8ba2d-6c87-4f40-990d-b96cf466aff6/81380416893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23616031-7da4-4e46-b8fb-309409342cdf/ruxowuxopukimitesosofo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 5116 bytes
SHA-256: 32a960535af54ce4705ef16144fc284713350f909b0c84433aa8124c8526c7df
font_01_sfnt_off00007377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7377 11160 bytes
SHA-256: 387189310cd4f01a6f7a92e3adacd8a56362b7e08701a4bb0d452d25e01fd4f3
font_02_sfnt_off000097e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E1 16076 bytes
SHA-256: 6ec32df790ff57e580571502d774d7ec759bed8993571cfcab0c6307c7fdde7b

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