Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdded31c3d68a8b…

MALICIOUS

PDF

36.9 KB Created: 2020-10-28 15:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1db6761d5fcd6242d7f33f7cb20c06f6 SHA-1: d7bc8fb273c9ec867e3a63b84f56d93bfa14a6f4 SHA-256: 6cdded31c3d68a8be338877d482bc279295fa22c1c29738d0d679beb3454a0f8
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 the document is designed to link to external, potentially malicious, content, likely as part of a phishing or scam campaign. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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=johnnie+wod+pdf
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f89b6e8300df.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8863b06b427.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/7997049.pdf
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f86f9e3b9cf2.pdf
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5f93ff8ea0b66.pdf
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5f9902ca0165c.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/xanutomomuzifom_xapuxexapan_vakoj.pdf
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/gusoja.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8e5d21d176b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6437ec5b-ca03-440c-acf4-b7ba9258b41e/sudavovejafabolifib.pdf
    • https://uploads.strikinglycdn.com/files/00eb96c8-73bd-46da-a6f8-20a78a87f0fc/zeruba.pdf
    • https://uploads.strikinglycdn.com/files/afbd9abe-0467-4ac5-8a75-0f33ab31ec19/barijome.pdf
    • https://uploads.strikinglycdn.com/files/ccf02386-bec9-4f11-9498-46f64e156556/negiviwuzifisoxe.pdf
    • https://s3.amazonaws.com/fenatagazise/sceptical_essays_bertrand_russell_free_download.pdf
    • https://uploads.strikinglycdn.com/files/8946be39-870b-4093-b08d-76a5586869ed/kiguraw.pdf
    • https://s3.amazonaws.com/xakapudakadu/xepumonemazilaxubi.pdf
    • https://s3.amazonaws.com/xuzed/tegitot.pdf
    • https://s3.amazonaws.com/bajapovogam/bogardus_social_distance_scale.pdf
    • https://uploads.strikinglycdn.com/files/48f16938-1323-416b-8576-83d26721e759/barcos_para_dibujar_a_lapiz.pdf
    • https://uploads.strikinglycdn.com/files/e80ab231-2569-4da5-9292-48e1d6baa6c9/math_deductive_reasoning_worksheets.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_off00005370.bin
13f76cb228f016c40d337f4135ecd38cc625932c5e024e2092420e2d49299344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5370 4692 bytes
font_01_sfnt_off0000637e.bin
1efe3214d0105c5430c2862bbde2d46a3c9c45a6ccd35944408cb7d6f43c3f53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637E 10428 bytes

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