Malicious PDF — malware analysis report

Static analysis result for SHA-256 13deff81ad6ac00e…

MALICIOUS

PDF

34.4 KB Created: 2020-11-06 22:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0a9ce43a9b87314633026f970106b13b SHA-1: b60570ffbd1eaf1e5a3eff1fd626e296368a5e87 SHA-256: 13deff81ad6ac00e27a49bbd76a4585189d898f359c2dbd03595ad50afd8433a
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, likely designed to drive traffic to malicious sites or engage in SEO spam. The ML classifier strongly supports the malicious verdict.

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=salinization+lab+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fa4acac50089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f8e01ff0d307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f8d07842ffb2.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/favapoxun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fa40b8be79b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5fa08392c1d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f889cfd5dac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f95ff3f26f1c.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/dcbb52f8-a87d-4f8f-a595-5f438fab1212/78134154674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f0f638-50bc-49aa-b0ff-94058b94401c/69441764992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3550a53f-85b5-4bc5-8eb3-cce8243ab6de/xebozexabire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd89a34-2e34-40f4-863d-a1102ab4890c/26900396290.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_off000048ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48CE 5064 bytes
SHA-256: 168219ab339bf350dd90ff188100e5ba0769486cb5d2dc57b5d4f70bc56a4bd3
font_01_sfnt_off00005a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 10308 bytes
SHA-256: 0af7310ac2d39d6ebfb5c03a48b453c29d198cc4a12296d5b57a3a5afb0281b5

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