Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c65f38721811471…

MALICIOUS

PDF

225.6 KB Created: 2021-07-06 02:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad6a0f8e6bbdb28f58a2eb392ae48632 SHA-1: 9fcd4b681efa96d6742713c528be9b4b2c74b9fc SHA-256: 8c65f3872181147182edf14e8a6b04ced1c3569f95e9af3173e3d38b383f0ca3
250 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirector lure, specifically pointing to 'http://netcdn.tw/app/1094591345/pokemon-go-for-free-game-hack'. This URL is also listed as a known malicious redirector. The document body, though heavily obfuscated, contains references to the lure and the authoring application 'wkhtmltopdf', suggesting it was generated programmatically. The presence of a fake CAPTCHA heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0117

Heuristics 7

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-for-free-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-hack-online_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-buy-things-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/app-hack-online-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-items-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/4-tik-tok-free-followers_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-save_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_023_off00031bc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BC7 25576 bytes
SHA-256: ff8ecf15b7d0dccb6a291d69ac37f5cdcf07ad06524027a1a9f2a28fabf9f97e
font_01_sfnt_off000357cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x357CB 18360 bytes
SHA-256: 3f5f8afbca1afb7d5a7280d0fea0080561aa167918c496b16f0d46ebcd8c98d0

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