Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fece0b43b5b048…

MALICIOUS

PDF

41.9 KB Created: 2020-11-03 08:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d4b8c4b7fa8015ae90df8da4a1dee364 SHA-1: 3e4e198eb7475408257507735fa827960a210d5a SHA-256: 13fece0b43b5b048f02f645c632b00cbc71701cc862dcff2f20f0875ea4d576e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, https://ggtraff.ru/aws?keyword=pokemon+go+fire+tablet+download, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading a payload. The presence of numerous other PDF links further indicates a link farm strategy, likely to obscure the malicious destination. No scripts were extracted, but the malicious redirector URL is a high-priority IOC.

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=pokemon+go+fire+tablet+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f8ec1039000d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_5f9b03c4858e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f9469252ae6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f92134f70507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5f99e64533aba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f8e2ffcb0868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f87e2533204d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0510/3720/8741/files/totem_warrior_5e_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288f15e2-ba96-44bd-ac46-3f3da12cc09a/61847721798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2980/6242/files/joxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300892a3-5b73-4c91-bf77-036c6dee1007/58526770149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc1b887-419f-477d-bdd8-7dfad2e2615d/15031016473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8663ece-b614-4495-98ed-f2e6461b7343/18461350555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b917e10-730b-4b2c-ab6f-e62349f5f2df/mathematical_statistics_with_applications_7th.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3337/0007/files/teacher_resignation_letter_example.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_off0000645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 5348 bytes
SHA-256: 0ab4165cb2fb046fe727a597074b335ac7ce9fda233ce80c8975b42f7ca5c9e0
font_01_sfnt_off0000768a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 10588 bytes
SHA-256: 13951d1f60ddb1125e8c593242f9116a2053453a52a31fbd984af4dc62739095

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