Malicious PDF — malware analysis report

Static analysis result for SHA-256 850189a9f2bc12dc…

MALICIOUS

PDF

50.1 KB Created: 2020-10-06 09:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 96a0f0f66435adb9940dbc087f2fa2c2 SHA-1: 6653ee872d039dec1dd94f321728ea5c52d0b8e4 SHA-256: 850189a9f2bc12dce414066ab235c4a50c5f702f5303b8efcd48d405e6202f68
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=9.+s%25C4%25B1n%25C4%25B1f+fizik+proje+kapaklar%25C4%25B1 In PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/wesijabuworimiwoso.pdfIn PDF document text
    • https://site-1043295.mozfiles.com/files/1043295/pujures.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/pusugapefeniwa.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/jazutapolezujulisowuzomug.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/zosalulirexelawejesepimux.pdfIn PDF document text
    • https://site-1036676.mozfiles.com/files/1036676/mavugasivijonidaf.pdfIn PDF document text
    • https://site-1036652.mozfiles.com/files/1036652/77124001092.pdfIn PDF document text
    • https://site-1040001.mozfiles.com/files/1040001/xudinaperunofededux.pdfIn PDF document text
    • https://site-1040617.mozfiles.com/files/1040617/zujenoju.pdfIn PDF document text
    • http://files.mikeaguilera.com/uploads/1/3/0/7/130775588/2190877.pdfIn PDF document text
    • http://sopagi.pinchersandpokies.com/uploads/1/3/0/8/130874524/0abf616cad.pdfIn PDF document text
    • http://files.kelseysq.com/uploads/1/3/0/8/130814758/vewitizigov.pdfIn PDF document text
    • http://lototug.univ.ency-education.com/uploads/1/3/1/3/131379255/911dad9c19f6e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/wanibefame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3993/1038/files/fundamentals_of_grammar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/midtown_eye_care_macon_ga.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 4920 bytes
SHA-256: 212883f3b94623066258d57b811e2771ea386e03d3615b069178e60bc350d3e5
font_01_sfnt_off000076cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CD 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off00008078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8078 14456 bytes
SHA-256: 917e93f849b42329ea4860a0fe75e11be653fa6df5fcf0edca1edd022c19acc8
font_03_sfnt_off0000aae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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