Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95d022c97dfeab9…

MALICIOUS

PDF

88.3 KB Created: 2020-11-11 05:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f75e83933820f0f0cf9a0c6c8192c3bc SHA-1: 99cff0dc7b4208c0233e2fb0d21f0285c501f28c SHA-256: b95d022c97dfeab9d6718780005da62d3110d185d51144d02e2f4a94b9219127
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure, possibly disguised as a user manual. The presence of multiple PDF links and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/123?keyword=user+manual+for+nintendo+wii+u In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8751902322d.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/a1395d529.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/daxasolizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fa468959a256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f989f3bdbc58.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/koroxusegivezenatuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_5f98442dadfb7.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/tuloseneposuvew.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/maputike.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/0f154e42-16fc-48b0-9618-fd64007699ff/guia_santillana_1_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81953faa-6be6-4079-a582-b6ca198fceb4/hp_officejet_6500_wireless_manual_online.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/rinehart_slip_ons_sportster.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_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 5136 bytes
SHA-256: b99376b054abb0f30440db4def7e2f5a493184f3ff0eb765529e292289c03635
font_01_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 11820 bytes
SHA-256: 6bc03c00d55a508f712f539659b8ed625b611bb165885cda66cf6e93e1f31cb0

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