Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52ff9580050c5b0…

MALICIOUS

PDF

37.3 KB Created: 2020-10-01 17:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 964e82d26ee14a556a37a30584b0fae0 SHA-1: 2d28fc1af2b1140700797087c1177bc8ce11e1c1 SHA-256: a52ff9580050c5b01bf2d6b7b09fe35e0ff13958db879c76d9a7413ffde2ecc5
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=advantages+and+disadvantages+of+social+media+pdf In PDF document text
    • http://zonor.fruitsandrootswinetours.com/uploads/1/3/2/7/132740449/xovusag.pdfIn PDF document text
    • http://pajuzoful.readimun.org/uploads/1/3/1/6/131606156/reduguze-bofufazekasa-fedezoxovusunid.pdfIn PDF document text
    • http://files.alaskafoodie.info/uploads/1/3/0/8/130874012/kezosir.pdfIn PDF document text
    • http://files.lavernesartpotfolio.com/uploads/1/3/2/6/132695531/985f572576c6d.pdfIn PDF document text
    • http://kedafi.allysflower.com/uploads/1/3/0/7/130776680/gikoxasad.pdfIn PDF document text
    • https://site-1036883.mozfiles.com/files/1036883/togateresisikasorotanaki.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/fuwezimufatijiwojujiguv.pdfIn PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/14607991699.pdfIn PDF document text
    • https://site-1039658.mozfiles.com/files/1039658/24483641121.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/22177766185.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/76410935421.pdfIn PDF document text
    • https://site-1039562.mozfiles.com/files/1039562/nidozuju.pdfIn PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/28637686039.pdfIn PDF document text
    • https://site-1040082.mozfiles.com/files/1040082/mamepanatadosewemedudu.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/19905528272.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/zotogadufokolom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5692 5428 bytes
SHA-256: 6d81ff82ff2732f506a88c12d64fb130bb36aec792a5489d1d3f838ea0ff0fef
font_01_sfnt_off0000690c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690C 9196 bytes
SHA-256: 757f6c9325caded904587fd303a2a0e0b3c713272ab8d954689abae1a9f09148

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