Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f011c710417d06…

MALICIOUS

PDF

42.1 KB Created: 2021-04-26 15:29:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0105333feb2f9b2daebb80ccc05bf68a SHA-1: 117b7dc8de156f35f186e9e4de2bff12ab984287 SHA-256: c4f011c710417d06972d3ab8064a8f3d17c06b527faa874e3d531e8dc62aadd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-get-free-gampasses-in-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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://netcdn.xyz/app/431946152/how-to-get-free-gampasses-in-roblox-game-hack In PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/earn-free-points-for-robux.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-web-store.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/bux-blast-earn-free-robux.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/red-boy-hack-roblox-download.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/dragon-ball-fury-hack-roblox.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-meep-city.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-2021-april.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/7aykw-duncan-free-robux-no-survey-human-verification.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-someone-in-roblox-easy.pdfIn PDF document text
    • http://kpu-klungkungkab.go.id/new/public/ckfinder/userfiles/files/how-to-hack-sword-fight-on-the-heights-on-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004385.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4385 26660 bytes
SHA-256: 11fd3d4b5988503ee62912147e25b70a9b29c4390cff9f5f4983e489e2aa7f2e
font_01_sfnt_off000080fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 18880 bytes
SHA-256: 7016b48feebd7ac6e8a39b46c3b45380d37a9e9c7b48d9007df275309da40b10

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