Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2594c3cedc82c4f…

MALICIOUS

PDF

48.2 KB Created: 2020-10-08 14:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 176481eb8c3167237e27474c06e967f7 SHA-1: efd9878e7224e431e671f323f650197ee6ec05ca SHA-256: a2594c3cedc82c4f5afc4531fbcec1169f781b0c970112e69fdb62f99cbc4fbf
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=wonka+oil+pen+instructions', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Wonka oil pen instructions' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site. The presence of multiple links hosted on disposable domains further supports a malicious intent, likely for phishing or malware distribution.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=wonka+oil+pen+instructions In PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/41757863224.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/44038531703.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/82422218707.pdfIn PDF document text
    • https://site-1040136.mozfiles.com/files/1040136/dikajuzoneruwotenolozeza.pdfIn PDF document text
    • https://site-1043473.mozfiles.com/files/1043473/pevabilikorunowukimolulo.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/301396491.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/lipuve.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/lavodasapogafe.pdfIn PDF document text
    • https://site-1038519.mozfiles.com/files/1038519/74142255893.pdfIn PDF document text
    • https://site-1043485.mozfiles.com/files/1043485/65675535313.pdfIn PDF document text
    • http://files.simplymello.com/uploads/1/3/1/3/131398428/1343.pdfIn PDF document text
    • http://jezigoz.anna-needlepoint-pearson.com/uploads/1/3/1/8/131856054/bogug_muzafesez_jukawejizunowol.pdfIn PDF document text
    • http://files.jcountyacademy.org/uploads/1/3/0/9/130969984/nurisanoxuz.pdfIn PDF document text
    • http://files.climbtime2.com/uploads/1/3/1/4/131453576/0936600e32a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac670fcc-6c8f-4ffe-b690-e4ac1132ce8c/zenelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90f57a5-f365-4ae5-9f44-cd4dae010993/gijitedeturajixuwonatok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30d6498-115b-457d-a353-208601d6c834/bozafexirow.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_off00007df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 5004 bytes
SHA-256: 2ea30a8ba83a890ce20fa90704b197fad76864121814b16eefd3b3d13db81d1a
font_01_sfnt_off00008f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F14 10908 bytes
SHA-256: e81ea38f5cc8249049d188353d2b9b7819a16c5d15db627afd120422974eb7b9

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