Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c06793f5a18dc…

MALICIOUS

PDF

34.8 KB Created: 2020-10-11 12:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a214e448e2792c4edfee5f510b378cb SHA-1: 664ca9590e500940f13b0a118a558534dc30bb61 SHA-256: 6f8c06793f5a18dcd91fade3795b4fe0151ab6660065218d663d7b31d6f9bee1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link to a known malicious redirector infrastructure, disguised as a study guide. The ML classifier strongly flagged this PDF as malicious, and it also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary IOC is the malicious redirector URL which is likely used to funnel victims to further malicious content.

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 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.
  • 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://ggtraff.ru/strik?keyword=ccds+exam+study+guide+fourth+edition In PDF document text
    • http://sakix.thestockmansbreakfast.com/uploads/1/3/2/7/132712207/2471109.pdfIn PDF document text
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdfIn PDF document text
    • http://files.manifestthetruth.com/uploads/1/3/0/7/130739119/8148715.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/f2b82ab1-8e11-448f-bd22-3273fd7b7469/kajabegilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45d595d-a0ac-4b2a-996a-7aacd1845581/71257405626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263270d9-2f19-41ce-832c-9db9112ce927/88170666688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4a23be-09bf-4b43-9d10-6cee56feab67/68336978452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3efb3ed-1c06-459b-a281-930ce1fa0a97/83357082925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98059705-165f-4e98-99b2-d3258cca5c1d/dufovux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e81886e-fd5f-4c58-98f6-546e17b1ff03/54135274112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f4b463-c071-40ff-b063-beca059a365e/sefidiwujofaz.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_off00004a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A26 5480 bytes
SHA-256: 4ce2a6a5cb3fe0a14bd85bebcb6fe69218499c317dc6c1bff33544792c70cc40
font_01_sfnt_off00005cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 9980 bytes
SHA-256: 88498665f09641f4602eb53bfd0c11891e413489f298cb11805c43f05be70918

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