Malicious PDF — malware analysis report

Static analysis result for SHA-256 442783d861a9fda5…

MALICIOUS

PDF

226.8 KB Created: 2021-07-05 17:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6dfb2a51fd02e611f18e671f8e5b3466 SHA-1: d60226388995dd28a4ed17f0937b4b5bf6a96597 SHA-256: 442783d861a9fda5296795a52f94bd5e667a656fc0d406a59d45b3ebb49841c0
172 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA or human verification prompt to trick users into clicking malicious links. The document body and heuristics indicate lures related to game hacks and browser updates, directing users to external URLs. While no scripts were extracted, the PDF structure and embedded URIs suggest a potential for exploitation or redirection to a second-stage payload.

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-freezing-game-hack PDF link annotation
    • http://www.pspmrsmkkb.com/webopac/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/account-stealing-hack-roblox-zero_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-toys-in-roblox-codes_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/vampire-hunters-2-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/rc-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-no-human-verification-and-no-offers_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-admin-code_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-hack-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-gold_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-howt-to-get-free-hats-on-rolbox-high-school_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_off00032004.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32004 25576 bytes
SHA-256: 9b404ba4b711e560d4410c915b8f722b06b6905c49e53d7fbfbf0ee1ab74dc6b
font_01_sfnt_off00035c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C07 18560 bytes
SHA-256: a11090797fba95add85a04d21127eb7199c97bcd4358678f5699da9479354fc5

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