Malicious PDF — malware analysis report

Static analysis result for SHA-256 2675d399cc87aa96…

MALICIOUS

PDF

41.5 KB Created: 2020-10-05 08:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 387cd5f5d1132e61ebedf05ccfd72e7a SHA-1: e0e083201ddca9b2810c169e609c24bdf47167e6 SHA-256: 2675d399cc87aa969da20a8268f88fef2faf7a13a1252c231064aec11b198b97
124 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/strik?keyword=cs+lewis+allegory+of+love+pdf`. The document also functions as a link farm, hosting numerous PDFs on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this sample as malicious.

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://cctraff.ru/strik?keyword=cs+lewis+allegory+of+love+pdf In PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/71617177985.pdfIn PDF document text
    • https://site-1038581.mozfiles.com/files/1038581/21979861255.pdfIn PDF document text
    • https://site-1038395.mozfiles.com/files/1038395/xadomux.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/nizowulelutasene.pdfIn PDF document text
    • http://files.paulsongeneralmusic.com/uploads/1/3/1/4/131411197/4d591f5c6.pdfIn PDF document text
    • http://files.inneriversom.com/uploads/1/3/2/7/132741272/6229247.pdfIn PDF document text
    • https://site-1043833.mozfiles.com/files/1043833/tuwunibumuvozirevapakije.pdfIn PDF document text
    • https://site-1039162.mozfiles.com/files/1039162/66168422734.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/59604743622.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/xedulalapibiz.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/e0f08ba0-1ffa-4221-9b93-84e6629d270f/60331849614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c173ce-b814-486e-8541-1ebe46fa7ecc/22999263343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cce3c0e-cb9c-4f97-b517-70c4ce12b8e3/dovenodeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5e4bad-e68a-425a-9496-bd472c4b6b0f/6634272077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237bfe96-a619-4adb-99c6-fd4d1676a7f1/77156306351.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_off000063ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 5368 bytes
SHA-256: 185f7f246c3691a819fbdf1b8eb5f6459b248772ec245b6d0b7cf7c1eb77d448
font_01_sfnt_off00007671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 10228 bytes
SHA-256: 0f9193012758675bfed2011f12fb4ece10220d3f4c5973cf3e0956f0ea54f384

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