Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fd79a8198fae7d…

MALICIOUS

PDF

44.4 KB Created: 2021-05-17 17:46:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04699f87ee8a2194ae0fcc97f9f9f46c SHA-1: 3e4b58babb6159247dc80c49444cf5872b01c52d SHA-256: 39fd79a8198fae7dddd4d5fb2e4a6a01c448a694c4d93c01718e994957fdb60a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free Robux gift card generator" and links to external URLs, including one that appears to be a redirector. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the lure suggest an attempt to redirect the user to a malicious site for potential credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-gift-card-generator-game-hack PDF link annotation
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/google-moon-active_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hack-client_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-earner_GM431946152.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_off00005000.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5000 25412 bytes
SHA-256: 5e2d9a78b090cebff19d340697289b82ac7eea00fa0acc06e55fee0e64f4f5a3
font_01_sfnt_off00008a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A55 18640 bytes
SHA-256: 9c31dcaac4a0b50b5f0fc2170f059f54bc5506f6c6606d446db32e5f0aacf3a6

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