Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b985d25f0d58bf…

MALICIOUS

PDF

39.6 KB Created: 2020-11-05 00:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c8449ab386f92b6331a7cd81773bb254 SHA-1: 8ad782590d5e4f4fa5825cc706e459a47005bd95 SHA-256: 54b985d25f0d58bfee485ee4a0523357047c19e0153c87924141565a1821775a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a direct link to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=formula+for+propagation+speed'. The document body, though partially obfuscated, also contains this URL, suggesting an attempt to direct users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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://ggtraff.ru/strik?keyword=formula+for+propagation+speed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fa11f5ad323e.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/kakogu_sifafuv_xawoputuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fa062d716dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5f9a4c6d5d03e.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/velejobage_magudido_dawede.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/lafula.pdfIn PDF document text
    • https://tivaxuxilo.weebly.com/uploads/1/3/4/1/134131375/2864045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fa32516ce03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f8760ba70f56.pdfIn PDF document text
    • https://xuduburuk.weebly.com/uploads/1/3/4/3/134323667/kutalod.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/kogijuwudor.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/resesemeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/98830158532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a654e143-231d-4840-af2b-ba5b04f7b70c/Gay_stream_tv.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_off00005c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 5316 bytes
SHA-256: 574eaff80dab7ed24e5a3b875335b1c5aa7f761a905bfd884318e532b0c4743c
font_01_sfnt_off00006e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 10268 bytes
SHA-256: 992f7c3518bdd09d09924ff112ebac4f7aee60c1b2d5db4ea05ed2d9b76b2a38

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