Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3c846370681b81…

MALICIOUS

PDF

225.7 KB Created: 2021-07-04 09:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c044d2a234d86bb9e3017e1d002ecb3f SHA-1: d2e3d52d74c3531fbdbf75c7b83bd674c440d4db SHA-256: 8e3c846370681b81bf7da0d383aacde2c299f586ff172728dc5aeda49504f81e
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses a fake browser/software-install lure and a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0117

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/coins-for-pokemon-go-free-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-case-clicker-2021-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-buy-ksa_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-twitter-hacked_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-app-apk_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_off00031bfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BFE 25576 bytes
SHA-256: 0e7f67b1d6ef5cb26714b5f41e0536132a16b919e9f27b1eb20106c23c104062
font_01_sfnt_off00035801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35801 18476 bytes
SHA-256: 9ff974d9dbdb67c83b8d47bf69f7b8614023af81a4afe7536da33dd084476234

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