Malicious PDF — malware analysis report

Static analysis result for SHA-256 21285161dbe4ab27…

MALICIOUS

PDF

59.6 KB Created: 2020-10-03 23:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 662869742ee64ed1bf9ae1d3737a96d9 SHA-1: 95413f8b082847a47011a29c838f275372f190c5 SHA-256: 21285161dbe4ab27567d8e01794a72044d130eed5165ceff677b4d4564877f30
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains text related to 'Skyrim how to get firewood' and a URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it links to known malicious infrastructure.

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=skyrim+how+to+get+firewood In PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/vamejepomokijalujuvumi.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/26415932889.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/wexovete.pdfIn PDF document text
    • http://sozab.plainfieldvt.us/uploads/1/3/1/3/131398455/cd3354f50cba.pdfIn PDF document text
    • http://files.paulemoryputz.com/uploads/1/3/0/7/130776567/1705303.pdfIn PDF document text
    • http://files.buttevistaparentclub.org/uploads/1/3/1/3/131384335/fegewazowe.pdfIn PDF document text
    • http://files.typebtriathlete.com/uploads/1/3/1/4/131436978/xuruxinubeme.pdfIn PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/66060068833.pdfIn PDF document text
    • https://site-1039409.mozfiles.com/files/1039409/badadadilakuluzasipimuv.pdfIn PDF document text
    • https://site-1040038.mozfiles.com/files/1040038/55596258847.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/zavizames.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f3b928c5-1d63-4b2c-9e5b-8a9bfd32a962/wedimot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48b6fae-4e15-40dd-8edf-5d17195c0d37/66674783426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caa035e-6653-45d7-bc06-144797c7b9ad/getagefonewoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F22 4944 bytes
SHA-256: 8de2cfb98784d72a913586fbd3f9bb3c26e07be6b3e7c10938859e8ae6bb9073
font_01_sfnt_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 10352 bytes
SHA-256: 286542e57aebc57202539b861881db39e46e380d1068a713e93d9265c8948c1f
font_02_sfnt_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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