Malicious PDF — malware analysis report

Static analysis result for SHA-256 8694f4b062318856…

MALICIOUS

PDF

49.5 KB Created: 2020-10-01 03:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b366c36914dc9fd05b98b078d3bfaf9f SHA-1: aa2acfc54a17ffc960a0f134a1e1fe0936f491e6 SHA-256: 8694f4b0623188561d30a5d6d78830e90e6d5994e6068a889dbeaa8b7e1448b7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm or SEO manipulation tactic. The primary URL, https://cctraff.ru/strik?keyword=electrical+cable+size+and+current+carrying+capacity+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is largely obfuscated but contains similar URLs, suggesting the file's purpose is to drive traffic to potentially malicious sites.

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=electrical+cable+size+and+current+carrying+capacity+pdf In PDF document text
    • http://files.prosewizard.com/uploads/1/3/1/6/131606629/2954164.pdfIn PDF document text
    • http://mazareti.grapes.global/uploads/1/3/0/7/130740414/2572391.pdfIn PDF document text
    • http://files.5jcollectibles.com/uploads/1/3/0/7/130776132/walemukawuzof_kirunuropijudi_zubesupa.pdfIn PDF document text
    • http://files.jcvfitness.com/uploads/1/3/0/9/130969494/timonuvutudutuv-rotisupix-tuxikev.pdfIn PDF document text
    • http://files.m4khastings.org/uploads/1/3/2/6/132695530/subola.pdfIn PDF document text
    • http://files.countrypineslincoln.com/uploads/1/3/1/8/131871909/2610618.pdfIn PDF document text
    • http://files.number120designs.com/uploads/1/3/1/4/131453396/jagivafeb.pdfIn PDF document text
    • http://files.usna99.com/uploads/1/3/1/8/131856382/a70ffb5fc12d.pdfIn PDF document text
    • http://files.ecologicing.com/uploads/1/3/1/8/131856290/kegojiw.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/10289001733.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/62040316816.pdfIn PDF document text
    • https://site-1039793.mozfiles.com/files/1039793/51149891160.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/8e59dd7c-dd64-40d9-9c3e-7d1e0a2bbf9e/lepejixuwanidol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e485bbde-e26b-4c68-9f62-424d1a5d02a0/55081967776.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB1 5572 bytes
SHA-256: eb8c7046f273f42711e6a3fcf2da195ebbaa70f89c4f55301e18dcaabe88aae9
font_01_sfnt_off00007fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBD 10352 bytes
SHA-256: 8cc9e66789aab15cecb6f7760149f6a913fce4ba3a5d1db243326c28e1494702
font_02_sfnt_off0000a341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA341 16192 bytes
SHA-256: b1cf331302b84634c4763249839539d0b4c267073d1ed30a1f414f4d339182cf

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