Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfb1271b79168e6…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 23:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2531c0ab6b9a8c0e5ba56a5f4736be21 SHA-1: 9f61794ffef459efef30980359c2a71f4a039e56 SHA-256: 4cfb1271b79168e6e8ed21b156fa77d6ece859f92b511e6328ae22c6478eb109
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game hacks, directing users to the URL http://netcdn.tw/app/431946152/free-robux-generator-no-human-verification-or-survey-2021-game-hack. This URL is highly suspicious and likely leads to a malicious site. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document's structure and embedded URLs suggest a phishing or malware distribution attempt.

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 http://netcdn.tw/app/431946152/free-robux-generator-no-human-verification-or-survey-2021-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/free-robux-obby-working-100_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free4mobile-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/ancient-earth-hack-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/no-free-robux-text_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-do-you-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-rblx-market_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacker-in-roblox-deutsch_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-quiz_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/counter-blox-roblox-offensive-wall-hacks-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-tower-battles-cheats_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-a-bizarre-day-cheats_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/can-you-actually-hack-roblox-for-robux_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_002_off00002f2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F2B 22416 bytes
SHA-256: e6715aa59dc98f96bb1af948a54429b687b2a97b65777d0526d8e8519d27b7d2
font_01_sfnt_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 20028 bytes
SHA-256: 862718f3553914d13e7050f30ddf7e0bf5fdf78324d2cf1d5c4be66b223f3a80

Open this report in the interactive analyzer, or submit your own file for analysis.