Malicious PDF — malware analysis report

Static analysis result for SHA-256 8176f50ede8372e4…

MALICIOUS

PDF

39.0 KB Created: 2020-10-06 12:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 981e92ade30261f4df88f32bb999d817 SHA-1: f876fdabff5a1c317825ff72cb617d1c5749b4d7 SHA-256: 8176f50ede8372e491b1f1d78a8ce033623b1956a14b6a27aed5819ffeb773b8
184 Risk Score

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=loteria+del+abecedario+para+imprimir In PDF document text
    • http://files.frederickwarner.com/uploads/1/3/0/9/130968996/depulaguj_kubiwejerasurik_namuluxejulid.pdfIn PDF document text
    • http://files.ellajonesfilm.com/uploads/1/3/0/9/130969420/149de017c.pdfIn PDF document text
    • http://wakapani.greaternewhopelr.org/uploads/1/3/1/3/131379211/gejole.pdfIn PDF document text
    • http://files.faubionmiddleschool.com/uploads/1/3/1/6/131607374/8492748.pdfIn PDF document text
    • http://files.dogtownpestcontrol.com/uploads/1/3/0/7/130775888/5017959.pdfIn PDF document text
    • http://kijopobo.kellymichellebaker.com/uploads/1/3/0/8/130874679/5673650.pdfIn PDF document text
    • http://files.justfakeitbouquets.com/uploads/1/3/1/1/131163976/182356.pdfIn PDF document text
    • http://files.shelbycountycu.com/uploads/1/3/0/7/130740213/gizojeza_nolawuxe_fenexixotajezon.pdfIn PDF document text
    • http://files.krystholdavisphotography.com/uploads/1/3/1/0/131069887/lezinifes_sukunoxibeno_wirakebepoxowo.pdfIn PDF document text
    • http://files.mikesmeatmarket.com/uploads/1/3/1/8/131871786/09fac.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/1a7f1172-992e-473e-8012-aef9e8c2e376/27010041565.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_off00005ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC3 5124 bytes
SHA-256: dcc39af331867159707193c83345565cfb52e73f340eb2f1c0c128e12f5e0557
font_01_sfnt_off00006c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 10384 bytes
SHA-256: 2988d06ffc6c9566bed0c1ae4fefe07aac4bc7deb08ddc5f2ced048fc62cd986