Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd9c959133c542e…

MALICIOUS

PDF

34.2 KB Created: 2020-09-30 17:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b873f7839ed128278e02acb4919a2958 SHA-1: 623e529c1fd10d1ef548f6bf475f51c4f8917d20 SHA-256: 5cd9c959133c542e4a8a0071f2951cc2ff38b83577239336d813008152c920c4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to direct users to potentially harmful sites.

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://gettraff.ru/strik?keyword=cereal+box+book+report+template+pdf In PDF document text
    • https://site-1037854.mozfiles.com/files/1037854/3041154312.pdfIn PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/61782694018.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/xisuwanolefevedija.pdfIn PDF document text
    • http://files.meritacademychicago.org/uploads/1/3/2/6/132695919/magumirire-magawosumine-zokagalid.pdfIn PDF document text
    • http://tuvif.uniontownartclub.org/uploads/1/3/0/8/130873851/3a661481dd6.pdfIn PDF document text
    • http://files.positive-matters.org/uploads/1/3/1/3/131383949/e58b7fd9b589.pdfIn PDF document text
    • http://files.tateliberaswanson.com/uploads/1/3/1/4/131411688/3546704.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/1/0438/0160/8353/files/guide_itinraire_michelin_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1141/4943/files/archetypal_themes_in_romeo_and_juliet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc506d2-774c-4c41-a1be-910e81d825bf/11346308521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6383a0-94f1-44d8-98bc-2092310a3c00/44359764582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a488e1-fcc9-440d-83da-451252178379/9801717794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e7b123-a18f-4918-8cc1-05122b8e2645/fopez.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_off000049e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49E6 5184 bytes
SHA-256: 00634053efdc4bdfe73e521dfb3618ae54e0e261ce1b414c47c06204f4cc39d1
font_01_sfnt_off00005b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B72 9672 bytes
SHA-256: 5a795f1eb6274de39524c2ecf37908d8184eeff0e316be5fc327afbcb429c990

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