Malicious PDF — malware analysis report

Static analysis result for SHA-256 972de47a6961018c…

MALICIOUS

PDF

76.3 KB Created: 2020-09-21 13:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 22a7dc3bbb1299b8bd0f5a348acd2ad7 SHA-1: 576edfb7fc6dbd202e84fb869534f3bc9df2c2df SHA-256: 972de47a6961018ce7e8df13c3fba4193ab9f8b8f27016fc6cd5e90a56483ead
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.com/wix?keyword=mitutoyo+surface+roughness+tester+sj-201+manual In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9614e152-9064-4974-9a43-d4ec48af09d5.filesusr.com/ugd/8d0191_fe74979fe95f4b06aadf2640978212a0.pdf?index=trueIn PDF document text
    • https://01179b4d-3fe3-4b7f-806f-10c0e31e8b4f.filesusr.com/ugd/d6af85_4ee0c1c2a27a49208b6c7784b392f2b2.pdf?index=trueIn PDF document text
    • https://bf281b7e-7bf6-4994-b6cf-9ab2bdb4f71c.filesusr.com/ugd/e6092c_e404a546ccae4c79b8d71401a7b919b7.pdf?index=trueIn PDF document text
    • https://c8073e2c-1305-4513-a566-0806be8baa65.filesusr.com/ugd/952c2e_ed36ce1eceb54bfc88eada5f41a6b942.pdf?index=trueIn PDF document text
    • https://8280db7a-fb0a-4d40-8c2f-4ee31e1e88f3.filesusr.com/ugd/8dde66_5c10d859a8b14784aaf4bf3f6cc78cd9.pdf?index=trueIn PDF document text
    • https://4446afaf-26c2-4881-a608-bfd803b28419.filesusr.com/ugd/8127dd_ab7736eddcc246f39f3377e6893cff45.pdf?index=trueIn PDF document text
    • https://a2f9c7ab-9f54-4bee-a01e-506ebfbb92d4.filesusr.com/ugd/09273f_66c643594541457a89343385eb4a52b7.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/essentials_permissions_premade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/fahrenheit_451_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2090/9735/files/cans_training_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/math_worksheets_for_preschoolers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/tigatulani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/business_english_case_studies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/bowenubir.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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 5836 bytes
SHA-256: cd9f0732a36b90d6b50b344e5e4250af771366d283396c757f31c1ed86a48eea
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 15680 bytes
SHA-256: 7e98fc807eb25bbaa73f328053903a3a9b1cd218fcaff6621929a0dfcdaf5218

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