Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d2676a70281e2a…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 03:33:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 59bc0fb4883659ec8a0996a067ee8e9f SHA-1: 0dc0af3b998ad3fd4b642c648eb4afbc98ae2371 SHA-256: 22d2676a70281e2a8709c3e908d403c5420ffa9d4efaca5191fb4b014abe04ca
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links, specifically promising free Robux or game hacks. The embedded URL, https://netcdn.tw/app/431946152/free-robux-html-pastebin-game-hack, likely leads to a second-stage payload or phishing page. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user curiosity for potential credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-robux-html-pastebin-game-hack PDF link annotation
    • http://perpus.i2s-learning.com//repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-future-hack-scripts_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/pokemon-go-free-latest-version_GM1094591345.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-profile-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-link-no-verification_GM406889139.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_004_off000050d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D4 27020 bytes
SHA-256: ea67c818c5a2dd228dc4a91c30b296ea2bd95392e9d4b0efcca8eeceff04474e
font_01_sfnt_off00008dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFB 18952 bytes
SHA-256: 80b62f125ffed9cf90b72b580d8b6f54edcc4b97720c24887cac9416437685c4

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