Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d531c35beb4fdd3…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 18:58:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a4c391b26f94d9351ae0d0c80f8fd280 SHA-1: 1b0bc2db32f04e5957f84eda45c204dbec22b741 SHA-256: 0d531c35beb4fdd34d26dea3bda68adc5e44bcbe9d1d5e1fa51fa9a8dc192238
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that redirect to websites offering game hacks and free currency for popular games like Coin Master and Roblox. The heuristic firings indicate that these links are designed as lures to trick users into visiting potentially malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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-app-for-iphone-game-hack PDF link annotation
    • http://lib.uho.ac.id/library//repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-and-get-robux-and-vip-no-surve_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-now_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spin-coin-master-game_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_off00003029.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3029 23024 bytes
SHA-256: 85ab40978e869b5e6fb65017068b2ab3cee1bb68cd0d68ce4100800dde9af85a
font_01_sfnt_off00006401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 18340 bytes
SHA-256: 22ec7c2df2d9c103e59d81394999ffb41531b6d4357b2311b3951123c8e62034

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