Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c808e988412cae3…

MALICIOUS

PDF

40.3 KB Created: 2020-10-05 01:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88ba611920b9bb9b7ea2b74fd3cfc7cc SHA-1: 3fb3fdaaf9837cb3c777c22650793d18656589b7 SHA-256: 4c808e988412cae3d564a8242c098fe30266f84cc17065d6d818598045bfa01a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link identified is https://ggtraff.ru/strik?keyword=fce+practice+test+reading+and+use+of+english+pdf, which likely leads to further malicious content. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm, suggesting a tactic to manipulate search engine results or distribute malicious 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/strik?keyword=fce+practice+test+reading+and+use+of+english+pdf In PDF document text
    • http://bogemo.novembercustoms.com/uploads/1/3/0/8/130874493/8316103.pdfIn PDF document text
    • http://files.fourscompanymusic.com/uploads/1/3/2/7/132740430/7831300.pdfIn PDF document text
    • http://files.chicagoansunited.org/uploads/1/3/2/6/132681300/fexon.pdfIn PDF document text
    • http://files.lakegracecrc.net/uploads/1/3/0/7/130740517/mikomewunojifate.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/ca3c9a2d-8317-4cb8-9aa2-d97bb40ac324/vewebakigunupoluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c9637b8-1f03-4ef6-b40b-06f43247cfc7/wededivireziwux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ee2388-caa0-41eb-9386-410e3b0d8c33/37844445667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2a3000-2127-4423-b5c6-a675e668f6c5/movisok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ef13e8-7d0b-4710-97f5-d5d5203bd29c/jutefunomepusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb3698c-442f-4b2f-892a-be8c5a894f14/10331522851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f20427-bb44-4702-8050-79dc8d48c189/lalesupufurotizomu.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_off00005f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 5372 bytes
SHA-256: 72475ac5fb6a70fe08eb219147904535a1475ae789094b3caeb06804d329e5ad
font_01_sfnt_off0000716e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x716E 10336 bytes
SHA-256: c1b5f08e21705122cc1d5f5b69fb2fb8853895d8cb566c0fa682a1c4cfe63cb8

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