Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b5ca3c2eb59740…

MALICIOUS

PDF

226.2 KB Created: 2021-07-06 08:44:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c8c095a33b1757696d7107657ac087d0 SHA-1: 616e949c8ece71f80e3e679110fdd2b968a13f3a SHA-256: 84b5ca3c2eb59740c812d8b85d4fa90ce1d8d31bc777aef6bcdd3c14fad7725d
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 0.0118

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-pokeballs-code-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-jailbreak-has-anyone-gotten-on-cheater-island_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-for-pc-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-live_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/delta-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/cheat-engine-sandbox-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-spiele-hacken_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-jailbreaker-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-so-sick_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-stop-animation-hacking-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/133-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-roblox-noob-accounts_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_off00031ce3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CE3 25576 bytes
SHA-256: 5dc8b477213e4a1660913cf2ff85e073d02c69d70bac53a5cfaddbac18106273
font_01_sfnt_off000358e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358E4 18764 bytes
SHA-256: 2b8d77f3b755521c953943a53ea9c9bdc7eddb4f44d5f0c70a9198131f80890d

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