Malicious PDF — malware analysis report

Static analysis result for SHA-256 234451061bc825d6…

MALICIOUS

PDF

39.5 KB Created: 2020-11-03 05:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a07f1ea4cb7f84b8855cdcae80a1e4c SHA-1: b8cfccfc49de901ff99e9e7daa6134c6cf87fddd SHA-256: 234451061bc825d68b5c119f19e50ed197346ac8f9498426f4d3effe605e85bc
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Disable or Modify Tools

The PDF contains a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. Heuristics indicate the document instructs users to disable security software and presents a fake CAPTCHA, likely to trick users into executing a malicious payload. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ggtraff.ru/aws?keyword=my+twc+mail+sign+in In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5fa02cf99e392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f8b9e6a6fd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9790b3dabf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_5f9228c9e1b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5f94dea2356cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8f8ab9989b8.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/6fdc3ba8-1ba9-4a35-953f-904842c8a303/70852274179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11fb636-30da-4f98-a52d-62e26d0931f8/nevuzosogugofarog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717dc266-ca33-4114-891f-5c3a80a6eeac/fibekomopawileru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec46d94-856a-495e-91bd-25ed753a56f9/analisis_de_la_variacion_de_funciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2e0ab3-b937-49bf-80aa-b4798a8fc6ab/16403877722.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_off00005974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5974 5224 bytes
SHA-256: 2a23ce8ce63eeaea65a3b729f2cd107345a7f0c2752625e780981bab79901cf8
font_01_sfnt_off00006b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4D 10816 bytes
SHA-256: dcb4c5ab6dd135e072272a08774bcf9e63eb2a46f34bcc7b6eba54fc1f7dd98e

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