Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda7425acafb9496…

MALICIOUS

PDF

39.7 KB Created: 2020-11-05 22:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e702b83871fa5d85d4f1e41e5ba16a SHA-1: 1dc844c0f4c36f152382979c3d38e6c5e54216d5 SHA-256: cda7425acafb94967c5c39aaa767554c6061e8ee393333798c40232cca9413cf
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as a redirector to a malicious domain. The heuristic firings indicate this is part of a link farm, likely designed to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the presence of numerous URLs and the ML classifier's high confidence suggest a malicious intent to direct users to harmful sites.

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/aws?keyword=umich+2020+calendar
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f9c2e58db2aa.pdf
    • https://cdn-cms.f-static.net/uploads/4444351/normal_5fa001c2e06ed.pdf
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/2952709.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/2de010d282b813.pdf
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f91eb738be10.pdf
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f8a5cc3a34fe.pdf
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fa44c2bc71c7.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5f946ec80706a.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f9d75936634e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8eff445-50a1-4877-886e-cce02ed28536/bedukupasadofokekami.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e0d.bin
511792410713624c93e5df589cc7f8863cf7919835eebb13f37fa28e71deb1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0D 5264 bytes
font_01_sfnt_off00006fc9.bin
623b032d0e2cf8349df3410037144ce0cfa53e124f9de4fc9e9436af60ab82f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC9 10172 bytes

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