Malicious PDF — malware analysis report

Static analysis result for SHA-256 b444fac7a99e3270…

MALICIOUS

PDF

44.9 KB Created: 2020-10-15 03:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4244887cc26e80243947d61834d0a124 SHA-1: ba07ec73a3b101cb100a99a9b9a771637008391a SHA-256: b444fac7a99e32705f0e37753d22e4809b2a4e620da729f118513fdf894ca094
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://gettraff.ru/pify?keyword=exercicios+de+fisica+trabalho+pdf In PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/44469114166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f877fe606a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f878b7b1fc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f878e0b45a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f875c13a6baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f874846b585e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f875d8908c8e.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/bifulep-giwoxa.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/sosekazazalapebu.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mezuber.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/tojejasevodo.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/6641841.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/c77da619-4fa2-436b-b394-f24d72210e2a/55297550123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff6b529-e2ef-4d40-b3cd-b100d6c6e366/34209102272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ea76d9-e5a6-47a9-9c34-7540932f1402/wabavojapapesab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e183457-7c12-4eee-8c72-df3540a07e9a/pamuruvomipanunitewofo.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_off00006db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB7 5408 bytes
SHA-256: 326f23ada8f0427bbd1454d76166643e739675670fad2a25cd15976f35441ea7
font_01_sfnt_off0000800d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x800D 12496 bytes
SHA-256: 44543b517d9304f8b3108339b48258f341bc560e4cef09b9834c11cc33f481e2

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