Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e69c76eee050094…

MALICIOUS

PDF

36.3 KB Created: 2020-10-02 06:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 25aaeb2aa845629e799c99dac83b3ece SHA-1: ee516fd8de3a4a5be6d4656072d33a8c56b3388b SHA-256: 3e69c76eee05009479fac2bd55d3f27512629c81cb5038ca7b70c8559db52b6b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'codewords' and includes the malicious URL. The heuristics indicate this PDF is part of a link farm, likely designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=codewords+84+answers+screw+type+anchors In PDF document text
    • http://dijipe.yudancearts.com/uploads/1/3/1/8/131871979/dofoda.pdfIn PDF document text
    • http://files.stringplaycamp.com/uploads/1/3/1/8/131856769/ziliku_sumexibubole_bugizenadened.pdfIn PDF document text
    • http://ridifir.loveadelyn.com/uploads/1/3/0/9/130969525/5402300.pdfIn PDF document text
    • http://files.ladyristretto.com/uploads/1/3/1/4/131483662/413654e3c323.pdfIn PDF document text
    • http://xiresujo.samosetband.com/uploads/1/3/0/8/130874521/8417665.pdfIn PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/62884652520.pdfIn PDF document text
    • https://site-1040084.mozfiles.com/files/1040084/karotutudoxibesiwi.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/vubovibanofositavifabado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8348/5350/files/san_juan_schoology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9102/0961/files/21775340160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/domin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8012/5078/files/36299314438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/61316561094.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_off0000500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500C 5512 bytes
SHA-256: 56425e8f43bffca9dd28a3bab4e26c1ead63bdccd842c38291461fe4da48e8f3
font_01_sfnt_off000062e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 9888 bytes
SHA-256: f8f6fab7a701dfcbb139f5864eeea60ae7128b154c5a44ab0e610363b1789c33

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