Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7f0420ad1ff38…

MALICIOUS

PDF

227.0 KB Created: 2021-07-06 01:36:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: af57fb61428f6cf7d8eae47e3bef0ba3 SHA-1: 990ed2478843aebd3085bd4ebb18cd5335327f05 SHA-256: c2b7f0420ad1ff386d8ceb8a3f8f25119910c5299c6e5ccda8cfacdccb8af5ef
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains heuristics indicating it uses a fake CAPTCHA and a game hack lure to trick users into clicking a link. The linked URL, http://netcdn.tw/app/1094591345/pokeballs-in-pokemon-go-free-game-hack, is presented as a way to get game items, but the underlying intent is likely to lead the user to a malicious download or exploit. The document also exhibits characteristics of a browser extension installation lure and a payment redirection lure, suggesting a multi-stage social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/pokeballs-in-pokemon-go-free-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/drawing-tablet-for-roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-money-in-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-master_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_023_off00032073.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32073 25576 bytes
SHA-256: 025934573dcddb1be0403cdf2ad9ec85dda01ac7f073b3ab0ea6a490eb059c4e
font_01_sfnt_off00035c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C82 18592 bytes
SHA-256: 82f4afc7406ebe5a28a1c597f45e5a168974c05cdd58fa647e47c6f66546a38e

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