Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53bee5867f8f734…

MALICIOUS

PDF

47.1 KB Created: 2020-10-15 15:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c38403bfdac23ae2003577b08696e6c0 SHA-1: 067a25f0a6042c33638258f9e2263b414aca0b6a SHA-256: d53bee5867f8f7343877217764086c500f04361daa8d96161998220a273efd8e
184 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting, designed to redirect users to malicious infrastructure. One prominent URL, 'https://cctraff.ru/strik?keyword=mi+rutina+diaria+en+espa%25C3%25B1ol+pdf', is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm used for phishing or malware distribution.

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=mi+rutina+diaria+en+espa%25C3%25B1ol+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f872e2ca4a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f8780532d032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87a975f322f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87055dbc5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87418c156fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f87c04151ab0.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/motekexajijenijisalu.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/56ad63a.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/mafogalarimubu_xaxaje_deriwuvub.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/69cda82938.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kadupe_ripovu_jozovagazemewe.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/e73d6a239.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/df415b2.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/44b905c6-2efc-432d-8ec3-940a04111970/57695956640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14f00f2-8ee2-4f66-8229-ef59a7cbe896/kilomejaberiviwaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53918c57-955b-4c34-972a-7a0f3f05b61f/joximazejorerad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35052a97-44d9-4a23-8f32-bf7d7670567b/45098660343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8039e8ad-9b5a-4d48-852b-b72ebf514d83/35494488180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8567/0816/files/honeywell_thermostat_installation_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0054/4418/files/15117978565.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_off000075c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C1 5252 bytes
SHA-256: 5d12b11c04d4355fc18ba5073cb532558e4278c665142ec98307534d98aa3c53
font_01_sfnt_off0000876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 11524 bytes
SHA-256: b8f7bfd60e6ed05ae4716746a86b6d8f93f024b2e6c78d2d63ee77315d243738