Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5929cecc536bec5…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 19:24:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e80db34784883b770e68abca3ba12fb SHA-1: 08b8d0f658b3647abd6c5bd8c90b617c081358a6 SHA-256: b5929cecc536bec59b4b81f7ef3fc5e0ee156ec95f4a016f66c89c87d6015c8b
82 Risk Score

Malware Insights

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

The PDF file contains a prominent link and text related to 'Coin Master Free Spins Cheat', directing users to a suspicious URL. This lure, combined with the ML classifier flagging the PDF as malicious, strongly suggests a social engineering attack to trick users into visiting a potentially harmful site. No scripts were extracted, but the PDF structure and embedded URI heuristics indicate a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spins-cheat-game-hack PDF link annotation
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-robux-completing-offers_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/hack-for-roblox-nijitssu_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/youtube-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-coin-master-spins-2021_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_002_off000031bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BB 22688 bytes
SHA-256: ff7ae337b8a07c61cab86a213da184c2982ca9989f98dd76aa3d487456383d9b
font_01_sfnt_off0000649a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 18340 bytes
SHA-256: 31b040f11d31e2c25a3918167828aea55bdad87c8eae0a9348126ed232a1d2b9

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