Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bce7e11bb31fd2e…

MALICIOUS

PDF

60.3 KB Created: 2020-10-27 21:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d7d93eea4cca74b35a5bdcbcfd1fe8dd SHA-1: dd4ed1898f58422136b2fe5ddfa377bdcc780071 SHA-256: 4bce7e11bb31fd2e4e14b13fd79f00bc136f7f81becff2878440a8b3eed9fce8
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.me/123?keyword=basketball+referee+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f944c1511a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f8d0ab322f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8f425987c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f977537819eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8756decad7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8c754ec575c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5f90499c59efc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f888d508c5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9679f586040.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/baee712e-fd87-4e70-aa04-9333cc302c60/basics_of_anesthesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808cb353-7fbb-456f-8c29-89fc5811e97f/ropiketakobafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3488f823-1494-4da7-81f1-33ee1ba4f6fb/fuzeruxulufadipazobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3cdcb6d-c8e0-4d69-a87c-fbf1bfe4be69/natuxapeterewos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d57e98-38a1-40ca-a45d-9a2b6dc32ef3/karanon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b9f754-acf4-4dd2-af6c-c503da806b8e/rekapukepef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2c8439-866d-4e79-8112-4641a1980b69/anesthesia_a_comprehensive_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f873a45-0dcf-4847-8451-60c83327de6c/60236748792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb0190e-6267-4583-899a-11f3b46d8d2b/o_empuxo__um_fenomeno_bastante_familiar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ceb50e2-b129-4b7c-8a61-b5ea731383fe/55533107735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b4768a-b4c7-4952-8ebd-67e7fe68291c/kiwalijos.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_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 5432 bytes
SHA-256: a8729ee8fde43f5f2077c8c99d462ef41a5ef973b51484fb9a64512b3e7639e7
font_01_sfnt_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 10424 bytes
SHA-256: 201c010b606721ab128f5c28abdcfba6405fabc5093de1fa68df9f820a249eaf

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