Malicious PDF — malware analysis report

Static analysis result for SHA-256 387792f82340a8bd…

MALICIOUS

PDF

45.8 KB Created: 2020-10-02 03:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: a16e6f26218b858e80abc773262675e6 SHA-1: 573d73ea003f31c72f822a9c38573fd33ed66aca SHA-256: 387792f82340a8bdb0fb46b9cd5131882cbc1eda6d6bd7b93f423442f956203c
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=endnote+free++full+version+windows+8 In PDF document text
    • https://site-1038892.mozfiles.com/files/1038892/3977842137.pdfIn PDF document text
    • https://site-1039807.mozfiles.com/files/1039807/lafubunaxiwobiwovewur.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/10900422040.pdfIn PDF document text
    • https://site-1036721.mozfiles.com/files/1036721/nokaregajuguvasar.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/korimaxojinubeg.pdfIn PDF document text
    • http://pudosu.jvssartist.com/uploads/1/3/2/6/132681479/xefasijejugaxujuw.pdfIn PDF document text
    • http://files.healfromthecore.com/uploads/1/3/1/4/131406082/4590f79e969079.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/how_to_microwave_nathans_hot_dogs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9516/7654/files/twitter_beta_version_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3768/5920/files/11358782413.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_off0000748c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 4996 bytes
SHA-256: 970c0db2efbe8cc737ba3183920f24fbf120a6ce16123584af4f8957ea007d88
font_01_sfnt_off000085bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BB 10740 bytes
SHA-256: 820eb0238554abb300b7e80df168ebc82d13ab7aea3eba929079d6666a6d7279