Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ade7433562099a1…

MALICIOUS

PDF

67.2 KB Created: 2020-11-21 12:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bc08b523e7eed415b61df6524fd7f1 SHA-1: b6b9079428cf44d771c2ad71eb41b9248e8a8570 SHA-256: 5ade7433562099a1c165f3c3eb5f6d9d38be517ad0adecd419c754b69d136378
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=mass+effect+d20+character+sheet
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f9bfe971da74.pdf
    • https://cdn-cms.f-static.net/uploads/4459055/normal_5fac5fc628b61.pdf
    • https://cdn-cms.f-static.net/uploads/4412599/normal_5f9737d2677f0.pdf
    • https://nuburobu.weebly.com/uploads/1/3/4/6/134633580/7105580.pdf
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f94caca3dfd7.pdf
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fb2d75ed5a40.pdf
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/2743582.pdf
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f90c70916a55.pdf
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5fb4e3308d0b4.pdf
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/luvuvosavukize_seganop_nugifurol_bivade.pdf
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fa479372dfd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fafa8995-8730-469a-b906-178d5de80a43/xujemabatejaperiwisafoxij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7a.bin
b0720465064c66ecfb894bd257b2c69bf7507b260501ba613f5d1683e31143c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 4880 bytes
font_01_sfnt_off0000ce1d.bin
4ccc7fe637ae4c99dfe471bd473351fba5015609751ee654431ee394df3a6042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 10708 bytes
font_02_sfnt_off0000f218.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 4324 bytes

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