Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea86eb2efb82ca3…

MALICIOUS

PDF

48.7 KB Created: 2020-11-01 22:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2b161f5f9004ad497b9d10a1364ac76f SHA-1: 90cb9d573be0e98e91a08702181e2b41cea737bd SHA-256: fea86eb2efb82ca3ad19d9813335a9590adf0be77f15588c491df21061ec2759
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://cctraff.ru/123?keyword=tracked+soil+boring+rig', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content or exploit kits.

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/123?keyword=tracked+soil+boring+rig In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f91aa8e337b4.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/7443f.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/gojilakumogejefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f8de132c698b.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/1/0484/2930/1918/files/sozureref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9461/7498/files/495814314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6022/1864/files/barry_university_pa_program_forum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2750/2508/files/urinary_system_anatomy_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8938/5403/files/44362085166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0067/files/22768784745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7827/0628/files/erik_salitan_guide_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1682/9603/files/golonosanozadosome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7051/2040/files/741_operational_amplifier_datasheet.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_off00007f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F47 5260 bytes
SHA-256: 20ac8778854cfed002da788638a80b2a44c73c2296f3f05c0f44f8a257cd2f05
font_01_sfnt_off00009132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9132 10820 bytes
SHA-256: ea693a7e10cc959b1cc7df55b9d2458f5fac53134deff1e3370145992c93f8ac

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