Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cf66daa4e5e6c1…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 05:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d7be7fc74c7684737928c8d0d116043c SHA-1: ee7fc4d8217b7560e89ddb29fa1b215e9521d592 SHA-256: c4cf66daa4e5e6c154d836b08c5afc96f766038afffebba0b5271f80bff5902e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to various external resources. One of these links, 'https://gettraff.ru/aws?keyword=shih+tzu+breeders+in+phoenix+az', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be directing users to potentially harmful websites, possibly for SEO spam or phishing.

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://gettraff.ru/aws?keyword=shih+tzu+breeders+in+phoenix+az In PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/b62fa934.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/9092788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f8b066a5cc72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5f9d9931961b7.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/39c33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/39910915626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5a8dc3-fbce-4bb6-9c55-63946112a2fa/musashi_nagamaki_sword.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/le_reve_skin_care_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41042c4-69fd-464d-9788-d48dc4cfca4c/20591524072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53dbba9d-99ee-4942-8138-72dfadae4e80/vituxoboxepexe.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/tanewiwej.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/21-day_weight_loss_kickstart.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/zukudisojununaxirozibozim.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_off00006d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 5376 bytes
SHA-256: f28fd10951a1d6410ba662ed885b23449e50bacc8524f4e1660807518d9c5485
font_01_sfnt_off00007fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB9 10636 bytes
SHA-256: b17b8bccce8b30bfd81467f9e4c6a12c0d140354b7d88d7bb94b0823426a3396

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