Malicious PDF — malware analysis report

Static analysis result for SHA-256 4010e8bda226db13…

MALICIOUS

PDF

42.0 KB Created: 2020-11-03 19:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8cf2d7c3a7092b4dea9179a3fe24e7be SHA-1: d4ea86ff3f1a81a3788d285350834f3c56d6823d SHA-256: 4010e8bda226db13f5f3b5ca4eae9b59bf57b38cb156c2d240eb399d974abffd
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1059.007 JavaScript

This PDF document is flagged as malicious by an ML classifier and contains a link to known malicious redirector infrastructure. The document's content, including the embedded URL, suggests a callback phishing or tech-support scam pattern, specifically requesting recovery secrets or private keys. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure indicate an attempt to deceive the user into divulging sensitive information.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://cctraff.ru/123?keyword=frontier+yahoo+mail+login In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f9cc95fe1f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5f9df7d8c7603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f9bce077b452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f8f7939ac777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f87cff64b9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f9be6657895d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f89ee35bc507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f875f50d19fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9f9974ec883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f95b6e60ac7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5f9945991fcdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f9f0c2f9d084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f890ee28a676.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/1d486074-98f0-4716-b15e-fedf58241d77/gsm_module_working.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_off000064d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D6 4976 bytes
SHA-256: 5a59258c6dc2ad0dc0fad07f49ae64c0457b2ddc9445d8c5f7c3f419153e57e9
font_01_sfnt_off000075a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A7 10916 bytes
SHA-256: 1fe71f4bafda1c7a0897b7c69507f817c9130b2ba5b339f9e4a0bfd807bf1f88

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