Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb4bce33d908d4…

MALICIOUS

PDF

227.2 KB Created: 2021-07-08 05:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a3115a4251e9c47ce0ad8954fba963a SHA-1: 54843eb7933f286a052ad9bc5e2ae4d22bdde82f SHA-256: cdeb4bce33d908d47265c48ebdec814dc786710d0a97aea3c68703cbe57d1add
172 Risk Score

Malware Insights

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

The PDF document contains multiple high-severity heuristics indicating social engineering lures, including fake CAPTCHAs, browser extension installation prompts, and game hack redirects. The embedded URL 'http://netcdn.tw/app/1094591345/pokemon-go-free-mew-game-hack' is directly linked to these lures. The document's content, though partially garbled, suggests a lure related to 'Pokemon Go Free Mew', aligning with the game hack theme.

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/pokemon-go-free-mew-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/roblox-teethyz-dentist-how-to-hack-through-the-hr-door_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-someone-robloxs-account_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/1x1x1-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-jailbreak-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-to-take-roblox-eye-for-makeup_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacker-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/inject-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/fashion-frenzy-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/pubg-uc-free-2021_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/can-roblox-ip-ban-you-for-hacking_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-roubux-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-descargar-hack-para-roblox-2021_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_off0003215c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3215C 25576 bytes
SHA-256: 87ea67a1518f3465179bfc29f839417576064f145d4133227d386b3d6eb50ae3
font_01_sfnt_off00035d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D60 18520 bytes
SHA-256: c722b66d82b0963d98e6c1e8613bb1fafbd64d1d0cc375e47d178219cce680c0

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