Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81a02af49a7a08d…

MALICIOUS

PDF

59.3 KB Created: 2020-11-06 21:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a43f93c7c91b544f08f3ac96c6d2fdd5 SHA-1: 1a9aef7b2246cd3433094e9d9d6727b001d0b42b SHA-256: c81a02af49a7a08d1c8ef60a4c3d95ae8bdb8d7e028ff02d61a1bf3a6893a6bd
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 that redirect to a known malicious domain, ggtraff.ru, disguised as a TV guide. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection infrastructure. No scripts were extracted, but the primary attack vector appears to be directing users to a malicious URL.

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=tv+guide+baton+rouge+louisiana In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa338ca02160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cc462fe1-c0c6-4cb3-8641-62e949daeef0/54679104253.pdfIn PDF document text
    • https://mopuxupu.files.wordpress.com/2020/11/167740540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd2091a-4c79-4f86-ae3b-a4056c3aeee1/29706131754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbd8f5f-1895-441e-83aa-af6e7e1e95b5/16784787295.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/26960943304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3694fe84-924f-4773-9279-b26e557165d0/55061847739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c72602-db1d-4578-a651-9967dc300cb4/seronupufonoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629af1e0-8b36-4e4e-b825-0501d86d226b/95508635477.pdfIn PDF document text
    • https://vuresorebe.files.wordpress.com/2020/11/bemuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4c8689-5ec6-4994-adf8-72b21a53790f/leyes_de_los_gases_ideales_charles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7095dc6c-8e69-4020-8cd8-cb4d331879eb/76116259075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645d63dc-c192-4bfc-8953-bbab5e0a46df/discrete_and_combinatorial_mathematics_an_applied_introduction.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DE 5024 bytes
SHA-256: 73015f021e5d2e79bdbd548cb5108a355132ddccadbdfbf254d8ecd9d78a22e7
font_01_sfnt_off0000a9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F6 11592 bytes
SHA-256: 4f9f15c8548dfde4f8c31e2d7beede455df819c930d225ed2a97d0029155bf56
font_02_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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