Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ac859ab5645d0f…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 21:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96974f40cc8fd209aced5cd04e5fd16f SHA-1: 8d818274770aa90cd17fa80262c3d74c98576a81 SHA-256: 76ac859ab5645d0fe3494caf71d8dcde9dad2437140c27717aac6d9e7dbe1abe
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body and embedded links suggest a link farm or SEO manipulation tactic to disguise the malicious intent. The presence of multiple PDF links, some benign and some unknown, further supports the link farm hypothesis.

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.ru/pify?keyword=bringers+of+the+dawn+and+earth+pdf
    • http://files.pennylanecollectibles.com/uploads/1/3/1/4/131437515/2c789.pdf
    • http://files.backwaterenterprises.com/uploads/1/3/0/9/130969982/3237818.pdf
    • http://files.julianbullmagic.com/uploads/1/3/1/4/131453267/tonurujowu-gajedef-lujavuzupe-memakevaram.pdf
    • http://files.healingjourneyhypnotherapy.com/uploads/1/3/1/8/131871586/6539c4fa3c126.pdf
    • http://files.sylvanheightscondo.com/uploads/1/3/0/8/130874332/fumowoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/golang_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/introduction_green_revolution.pdf
    • https://cdn.shopify.com/s/files/1/0450/3266/9334/files/normal_blood_pressure_by_age.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/career_coaching_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/flat_towing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/dialectic_of_enlightenment_philosophical_fragments.pdf
    • https://cdn.shopify.com/s/files/1/0428/9826/0124/files/31738556672.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/12530973803.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/knee_exercises_physical_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/bulla_dragon_ball.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/gozofizajez.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/muzumafude.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/mavibasa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a8.bin
1b0d0fc952b8eaa03c5825a7b8a8e2dc7221df29276f8f92564bef0ca9efc724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 5412 bytes
font_01_sfnt_off00008319.bin
4219d66ee2098b90971fb3802700fb3b4dd3604314e725fdf05a0fc781010d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 10320 bytes

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