Malicious PDF — malware analysis report

Static analysis result for SHA-256 463804572e27e58c…

MALICIOUS

PDF

32.6 KB Created: 2020-11-02 13:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ff13f1a4ffb927b40e0c1cbbf545ab20 SHA-1: bddb83db9f6f3fef92dd4cd93be0e9b82450d6e6 SHA-256: 463804572e27e58cb0a95430c45f7f490318342f3a402155f2b88e3d3d1d30b4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to Shopify domains hosting PDF files, likely as part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/123?keyword=chi+squared+test+bozeman+science'. This suggests an attempt to lure users to malicious sites under the guise of providing educational content.

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/123?keyword=chi+squared+test+bozeman+science In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f8c18593b0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f891a9a1707a.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/sufiwusukukekidu.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/1/0505/9100/6888/files/78972351646.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5738/1027/files/american_history_2_study_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9844/7778/files/figuras_literarias_para_primaria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1734/7487/files/rolizasasulosegevod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2578/3713/files/96512027410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3446/5224/files/boot_and_glove_dryer_walmart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5148/9701/files/40926689330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4181/1353/files/gozupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6377/6677/files/mercedes_benz_cpo_warranty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0748/1258/files/15128586206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7669/6226/files/adding_vectors_worksheet_answer_key.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_off000043a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A8 5368 bytes
SHA-256: 0bd604f4a22224a6b2598ca0a32072b9a8c8ea249f1a61cd932ddad5d4f4c276
font_01_sfnt_off000055bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55BB 9384 bytes
SHA-256: 6a4022829c4fd11bb3af89d0afcb63ad19889a0b8c2e30f0d37b81a858d9c005

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