Malicious PDF — malware analysis report

Static analysis result for SHA-256 c506ecc42ea03d37…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 10:34:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 82e09384cf80b466ed699986bf703018 SHA-1: 186343e8943c6da177248e6545b269243e541f7d SHA-256: c506ecc42ea03d3746dde64a7ba087c67dc50ddfd934a0a0668e9de30c4c43da
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, specifically 'https://netcdn.online/app/431946152/rbx-com-game-hack'. This lure is designed to trick users into downloading potentially malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack, likely leading to a second-stage download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/rbx-com-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000519a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x519A 25288 bytes
SHA-256: 761762d7fe3a0f37e4cd5e72210cb5ff1ca97449a431a1a01530dd51b50e5023
font_01_sfnt_off00008ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA4 2828 bytes
SHA-256: a4e15770ab3b920ccbab17816ac2be280610f3f789d7654b00721cdcc5d65b79
font_02_sfnt_off00009559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 17972 bytes
SHA-256: dffe5730268319e8d6523eb3a7b4d2737e6b1bc7523d2c18f722e59dff9dcb58

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