Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f5919d9347035…

MALICIOUS

PDF

66.2 KB Created: 2020-12-07 17:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01bd61d0a3b5b7de5a7470bbf1cbe8aa SHA-1: 1367c054b5c1f546b10d4b85e240e13fca59164a SHA-256: 4b8f5919d934703540b0be05804c3528b1cad6f9fa87dc8c38ee904752d2a17c
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body, though heavily obfuscated, contains references to 'Rebel without a crew pdf' and appears to be generated by wkhtmltopdf, suggesting a lure for users to download or view content, which then leads to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=rebel+without+a+crew+pdf
    • https://zirodaxe.weebly.com/uploads/1/3/4/6/134611642/vemudulowuvizov.pdf
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/lonixidijukux_nimigol.pdf
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/f305ed7aa3.pdf
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/bc93754173c0.pdf
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/bamiwu_tidixapemoru_zorabu_fikowubilaju.pdf
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/355062.pdf
    • https://cdn-cms.f-static.net/uploads/4480148/normal_5fae136eb635e.pdf
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f9dc95ea4bc0.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/4000587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ac301f3-e7f1-4d94-bcc2-3889a7588788/1260591249.pdf
    • https://static1.squarespace.com/static/5fc58676affbf90a6609dc37/t/5fc8c30f13f8d93bf20ca694/1606992655402/table_tennis_racket_set.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfbeb61e25426e1fee509/1606286315587/ratevoxowo.pdf
    • https://uploads.strikinglycdn.com/files/a6e60bb7-3b4a-4628-b2ca-f4e343366c87/57137496551.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4cd.bin
3992e05bbeb0142a8a9d072fc113d9ed1ae5bb8a721efc735d6185f14fa11701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 5304 bytes
font_01_sfnt_off0000d6e4.bin
3feff6d61de3ce3d22441f97b46ff063022838d4e07a279963bfa6d790775b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 10924 bytes

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