Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c6a553d032faf8…

MALICIOUS

PDF

33.5 KB Created: 2020-10-07 21:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 073064408009478031d0a3c2892326e5 SHA-1: d0282b9ebf6af484aa0afaac8411f09b018abc94 SHA-256: 70c6a553d032faf8a627bfb445324c8b3ce0640a0f0bd8c7fd44b2a5fc5d97ce
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDFs hosted on various domains, many of which appear to be part of a link farm. One URL, https://gettraff.ru/strik?keyword=careless+whisper++320kbps, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also 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=careless+whisper++320kbps In PDF document text
    • http://nuxumuvir.babyg-lash.com/uploads/1/3/0/7/130775583/1617803.pdfIn PDF document text
    • http://files.kcpuppetree.com/uploads/1/3/1/8/131871414/6186546.pdfIn PDF document text
    • http://pusov.artistsalive.org/uploads/1/3/1/4/131453588/regefobimugaj.pdfIn PDF document text
    • http://files.hortyjacobsphotography.com/uploads/1/3/0/9/130968996/5294327.pdfIn PDF document text
    • http://kudow.heartofyogarva.org/uploads/1/3/1/4/131437906/7419730.pdfIn PDF document text
    • http://files.hopevalleywineandbeverage.com/uploads/1/3/0/8/130813546/bafes_vajokatovixe_zapomozodejemi.pdfIn PDF document text
    • http://buruza.elizajanegilchrist.com/uploads/1/3/1/3/131381675/sevusuli-tulowure.pdfIn PDF document text
    • http://rusexe.dndpromotions.com/uploads/1/3/0/8/130813715/17a90029996d.pdfIn PDF document text
    • http://files.msmorales-chemistry411.com/uploads/1/3/1/0/131070289/9234963.pdfIn PDF document text
    • http://xikopor.drjasonplatt.com/uploads/1/3/2/6/132681647/4007642.pdfIn PDF document text
    • http://files.turtlerecording.com/uploads/1/3/0/7/130776040/tasetudijawesid_gizupobo_davutum_nefosonar.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/adac2c50-d90e-4e7c-81a8-f90f2f384897/46910454253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09892a75-ac70-4362-b148-200973c6ceb0/47750554417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b9ad0f-54fb-42bb-af26-2af68fbe0910/43606142956.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_off000041cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41CD 5544 bytes
SHA-256: 6b2711abcdbecf0d7c6e8f83444cd12f4ad1c0dc140af2fbc25a638a8cb9ff6a
font_01_sfnt_off000054a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54A8 11332 bytes
SHA-256: f44bbe35d20b1a839ec5024ae74317f7c9c15934195b29009ffab45ef7c5183f

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