Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141c20c31e5b714…

MALICIOUS

PDF

39.1 KB Created: 2020-11-04 09:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b864a305f8460e575e738ca12433757a SHA-1: 28568847d77b6e646e4b910afebd4c745dec83b8 SHA-256: e141c20c31e5b714f5b1bfda00f38510efbd9a4953eb5b67c2a3f5d797b45ca3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The primary malicious URL identified is https://gettraff.ru/strik?keyword=unifi+g3+pro+camera+default+password, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a link farm or SEO poisoning attack. No scripts were extracted from this sample.

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/strik?keyword=unifi+g3+pro+camera+default+password In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f9425e62e859.pdfIn PDF document text
    • https://belujewirozem.weebly.com/uploads/1/3/2/6/132681559/607664a20ecda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f8fee9831f61.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/kopepuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fa233789e26d.pdfIn PDF document text
    • https://jedufopev.weebly.com/uploads/1/3/4/4/134490540/luxokoseworot.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/7286257.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/228c26ae113.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/d0e97af0-9a0f-4700-9ed9-fda40c2c7cf3/xalegakekufunofepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f006f125-4c60-4ad9-a7e4-2a080543644c/falcon_pi_player_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e78d666-1c7c-447b-a5f8-a4f4aa29e234/1499715483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542858ac-1454-45d8-816c-5d0d8790c42e/jojapaxatelobozejezivajoj.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_off0000586c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x586C 5724 bytes
SHA-256: 23362b05dc7ddae14eefa8051ac6aeef234a3af7e2677af2bbd417f179bffb78
font_01_sfnt_off00006bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 10540 bytes
SHA-256: 6b728c1ff986693ba9e5c8f1d66e5b241f332b5fe71d346e59d0005157bd9239

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