Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef650518d7550de3…

MALICIOUS

PDF

46.4 KB Created: 2020-10-28 17:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 4f2a812583d413a9951471f606d78612 SHA-1: 84dae0b6ebe28e5041c5d753ef662fef9229b645 SHA-256: ef650518d7550de3136f371f707abeefaa065ca31f4cb52f919633156f3565bb
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/aws?keyword=warrior+fall+classic In PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/9212097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874bb4a9086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f878a992f893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f8d049116890.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/nakofiruzifanu-dexur-wavut.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387589/normal_5f96e146e1bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8fa7f44b1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5f905cecbda49.pdfIn PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/wezejitufagat.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/13409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5f93a2b78f357.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/9925955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5f9736fd5027d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007797.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007797.bin)
    • https://s3.amazonaws.com/jamokaroxoj/46169414008.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/rolaxama.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/ambiguous_genitalia_approach.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/mironuponosidugotaze.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/algoritmos_ejercicios_resueltos.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 extracted file (font_00_sfnt_off00007797.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 4888 bytes
SHA-256: ae3772daad9e684eb70303dd5ec5149544fd8f2114e36f937c4991183d99f13e
font_01_sfnt_off00008859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 10648 bytes
SHA-256: 79b088d1426e402fa324b73588a569d8f444fa07615ed8a3cdfaed3e31be3311