Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bc61eec19ba4a0…

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 05:16:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 48be4e5ed16d015b8f24f08643efec7f SHA-1: e5c9f21c20e189027ef37a9933fce55bd4322148 SHA-256: b3bc61eec19ba4a0e50a30489476c3473bbf16768dfd619e923280da247bcc92
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/mistplay-robux-game-hack PDF link annotation
    • http://www.pentathlon.org.tw/data/file/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-coins_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-no-anti-bot-verification_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_off00004a9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9B 25220 bytes
SHA-256: 920f2fc80da54fdd33e4a81ddf87abd553eba06ba5e6c97aa456ff0049907605
font_01_sfnt_off000084d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 18928 bytes
SHA-256: 4353d9d8b624be656c092b8c8f3622dfb05908b0fd9cf93c1f73531fdc9e42e9

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