Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8cec527b31ea00…

MALICIOUS

PDF

33.8 KB Created: 2020-11-03 10:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f91a062453358d4bc372ed812198f189 SHA-1: 814521b414cf021c227505ea2f864e093d299717 SHA-256: bd8cec527b31ea00acbe046338e2001d4df159192baea880b6e0451931ea2445
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious PDF files. The primary URL, 'https://ttraff.com/123?keyword=who+wants+to+live+a+million+years+darwin', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/123?keyword=who+wants+to+live+a+million+years+darwin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f9ac401261e3.pdfIn PDF document text
    • https://duzikasaropofe.weebly.com/uploads/1/3/4/4/134489835/wulegorotesorapu.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/1371c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8ed762b2008.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8e62e691486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f9d64f9bd1e3.pdfIn PDF document text
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/0ab3cd031206d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f89641a1d590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_5f9ef6d919a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5f9d3edeabafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f89c28057415.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/a6bdeaa1-cace-4580-b677-1c5f6a02d7b0/himno_escuelas_secundarias_generales_puebla_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b85bd8-78e4-4385-b95a-b7af08a8889e/gigafemol.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_off000047d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D1 5332 bytes
SHA-256: ffcbddd09c318f3473f0b1f1f6503962a32b5d6ce9daa156591cfbb8bff48505
font_01_sfnt_off000059e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E4 9512 bytes
SHA-256: c54ec80053eae4b2f9800832d6a96ddc50b725ba6cecd80f723ae48581b35809

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