Malicious PDF — malware analysis report

Static analysis result for SHA-256 959ce9476537a8c5…

MALICIOUS

PDF

41.2 KB Created: 2020-10-07 00:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec28044c081e0f9e99a0a9a705f726e6 SHA-1: a5f36249baf3989397868ea763ff26bec3d896a0 SHA-256: 959ce9476537a8c58427b80aeca112b1d9d2b62e1eeb10a6edb8b3cb07de649d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links designed to mimic search results, leading to a link farm. The primary redirector URL, https://ggtraff.ru/strik?keyword=oxford+english+dictionary+9th+edition+pdf, is flagged as malicious. The document body, though heavily obfuscated, contains references to the same malicious URL, reinforcing the intent to redirect users to potentially harmful content. The extensive use of disposable hosting for the linked PDFs further indicates a malicious operation.

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://ggtraff.ru/strik?keyword=oxford+english+dictionary+9th+edition+pdf In PDF document text
    • http://files.shiawasseefreemedicalclinic.org/uploads/1/3/0/7/130739206/2494133.pdfIn PDF document text
    • http://xapuru.mysuidora.com/uploads/1/3/1/4/131437626/nonumodawizerafos.pdfIn PDF document text
    • http://files.tacomarc.com/uploads/1/3/2/6/132695212/gizuvute.pdfIn PDF document text
    • http://files.eletesegeszseg.com/uploads/1/3/0/7/130775845/1811379.pdfIn PDF document text
    • http://files.catgirljourney.com/uploads/1/3/1/3/131381607/losalaroburi.pdfIn PDF document text
    • http://files.mclaughlinesq.com/uploads/1/3/1/4/131407051/fb19b278.pdfIn PDF document text
    • http://zisisege.mindbodysoulutions.org/uploads/1/3/2/6/132681670/gorunoleviraz_vosozo_jomelijoti.pdfIn PDF document text
    • http://files.crainbrosinc.com/uploads/1/3/0/9/130968960/3824345.pdfIn PDF document text
    • http://files.thesassyheiferboutiquellc.com/uploads/1/3/1/3/131379510/vadisifu.pdfIn PDF document text
    • http://temepev.stanalexander.com/uploads/1/3/0/7/130775052/junufulodoz.pdfIn PDF document text
    • http://files.esoterikosparanormal.com/uploads/1/3/1/4/131406806/zesitu.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/c9f2935a-300f-4eeb-86f4-c0105888a866/7715540073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9453635d-82ae-4676-8a94-bbf504abf563/viverelaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8f878e-74fb-40e6-8865-a5ac5d37856f/nokedotu.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_off00006084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5768 bytes
SHA-256: d1ccdb0f6cc29522b510851cf9c963c76680e3cf5ddb38f8e059953391bec3c6
font_01_sfnt_off00007436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7436 10524 bytes
SHA-256: 0544920d93e5f5eca679e10e4a95db316fc94762119dac9c7be97d0e3bada67a

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