Malicious PDF — malware analysis report

Static analysis result for SHA-256 3197a63be35ad86a…

MALICIOUS

PDF

78.1 KB Created: 2021-01-10 23:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a20c0f5dc39a27c438440c270cb720de SHA-1: bdcf5ee32a302562d20e30698360b9643807140b SHA-256: 3197a63be35ad86acdb3f96faef5d24e0ffc7720ad2c2f12b4e78f8be09a8e9f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link farm designed to redirect users to potentially malicious websites, as indicated by the critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, appears to reference 'Hollywood casino aurora poker room', suggesting a lure to attract clicks. The presence of numerous embedded URLs, many hosted on disposable domains, further supports the link farm and SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=hollywood+casino+aurora+poker+room In PDF document text
    • https://fexifeter.weebly.com/uploads/1/3/4/6/134612515/3cd13a1da91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_5fc3436a95860.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/linabe.pdfIn PDF document text
    • https://gobibozuvabi.weebly.com/uploads/1/3/4/6/134683572/8cf4220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8b646d56c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fa95eb76a54d.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/366107.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/22bc485c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426066/normal_5ff3c49e3c7f6.pdfIn PDF document text
    • https://jedegifopa.weebly.com/uploads/1/3/0/7/130738854/4b01f7cfc80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5ffb4034d2929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fad81da70bb3.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/tawakodafijop_pomowu_lobujat_tagomib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/reformed_theological_seminary_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/fujatipadadoro.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_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5436 bytes
SHA-256: b16f741b74a80b68d8a75d6bd0d3cd2fd349d354e8f64e7045c3b749e1c79b10
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 11460 bytes
SHA-256: 0d2ae2dd6ffe484da9789d24489dc502105cfb8a5b29771bb33f9704a6b62f9a

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