Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e17a3617c1b51df…

MALICIOUS

PDF

40.6 KB Created: 2020-10-01 23:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 385cf6b98a91539aa22d189af5820038 SHA-1: 5bb6ef7841c4b5d8aaa357788132cdde7daf6d9f SHA-256: 3e17a3617c1b51df3024b5831f63b427cef5bd8b44f2e2ebe7cd88e6afcf3f71
184 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a game cheat download, which is a common lure for phishing or malware distribution. The document body and embedded URLs indicate a link farm designed to redirect users to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=download+gta+san+andreas+cheat+file In PDF document text
    • http://diseb.mosaicartbyabbe.com/uploads/1/3/0/8/130874038/woduwudosara.pdfIn PDF document text
    • http://files.culturalenquiry.co.uk/uploads/1/3/0/7/130739662/rasofoto.pdfIn PDF document text
    • http://zalosase.thechangemanagementnetwork.com/uploads/1/3/1/3/131384778/f6085f81d09eddb.pdfIn PDF document text
    • http://files.meredithreyesfit.com/uploads/1/3/0/9/130969485/8856945.pdfIn PDF document text
    • http://pavomozos.thesettlementclinic.ca/uploads/1/3/1/0/131070934/2fb0b.pdfIn PDF document text
    • http://files.mychicagotailor.com/uploads/1/3/0/9/130969999/3391368.pdfIn PDF document text
    • http://files.thetravelvice.com/uploads/1/3/1/8/131856188/1bf03f5.pdfIn PDF document text
    • https://site-1036920.mozfiles.com/files/1036920/74287488384.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/79661511688.pdfIn PDF document text
    • https://site-1039878.mozfiles.com/files/1039878/90264964297.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/1/0494/9884/9438/files/7508677853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7625/4873/files/strychnos_nux-vomica_common_name.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/10954647871.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_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 5376 bytes
SHA-256: 3df76c7f73d28352c9dab741a02af04871d244d907f3ea850a6bb5d86f85baeb
font_01_sfnt_off0000726b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x726B 10340 bytes
SHA-256: c60d8b2fcac10d368635b997b2cba348c5b84ff57f8aefb7817204df428dfedd

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