Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66df02840b164e7…

MALICIOUS

PDF

41.2 KB Created: 2020-11-09 16:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0a6fdccf75df909ef0b460820e04f858 SHA-1: 7dda043910eaaa0141a8a240e81e3cb4ee47a5fa SHA-256: f66df02840b164e778222e2952c26e6d7e4fd6bd17e5bf0bd0241f8606d0dcbf
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a known malicious redirector, disguised as a coupon offer. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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://cctraff.ru/aws?keyword=papa+john+s+coupon+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87133a82d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5f9afe90ebe6b.pdfIn PDF document text
    • https://dosifezo.weebly.com/uploads/1/3/4/6/134619581/nifod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f99961438317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5f92874e5d5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f870de26b9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fa51a28e034f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5f900a8dad322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5fa26ce0a04ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f98f72b4963f.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/e6cd0270-4a77-4a82-8f4f-3de6b15b890f/93405488820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3307e4b-4ebd-4fa3-840a-9a7e62dce54c/pipekoxuserimotefolep.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_off00005fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5244 bytes
SHA-256: 34c5514061b1a058480662600fb5083c536fe4b242db2ac0cc21bc14d76629c1
font_01_sfnt_off000071b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 11328 bytes
SHA-256: 741b634ac1cdce8dc209b1331c203b3a31a78a54a1e1886a4e4fe8e23c435919

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