Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0caac93657c1ca6…

MALICIOUS

PDF

44.8 KB Created: 2020-10-03 22:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f5fa8e23099dd2ed8ca390231d470b23 SHA-1: ad2253f5688105bee609cc4782b510e39f2cbe6a SHA-256: b0caac93657c1ca649be41d7162d49eb28bcf5ee4d8eeb938cb5a0488e002a58
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and appear to be part of a link farm designed for SEO manipulation. One prominent link redirects to a malicious domain, suggesting the primary purpose is to lead users to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=autodesk+maya+2019+basics+guide+pdf In PDF document text
    • http://files.nlrchamber.org/uploads/1/3/1/0/131071308/293049a3c.pdfIn PDF document text
    • http://files.nietcivil.com/uploads/1/3/2/6/132682555/sigivubozofeja.pdfIn PDF document text
    • http://files.brandynoir.com/uploads/1/3/0/8/130814675/duvefanixopot.pdfIn PDF document text
    • http://files.seattlefamilychurch.org/uploads/1/3/0/8/130814611/9fba98.pdfIn PDF document text
    • http://sorotuweb.sacredheartparker.org/uploads/1/3/1/1/131163667/838512.pdfIn PDF document text
    • https://site-1039311.mozfiles.com/files/1039311/55489298188.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/wolemodiwum.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/62955883783.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/37726680937.pdfIn PDF document text
    • https://site-1039283.mozfiles.com/files/1039283/74837445617.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/25611939139.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/79744615527.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/68616896087.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/vuvepomoxikujawiful.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/7102767594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000700a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700A 6124 bytes
SHA-256: 9947489b5ab4bee7717fd50d21c5e21d264d93b79738e86acc15f4126fdddbd2
font_01_sfnt_off000084e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 9808 bytes
SHA-256: 898b2d1d309a77f335eeb48c9071dc53da372c6b048f198bf11f71fcd689d550

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