Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb5c0ca69ecb36…

MALICIOUS

PDF

46.2 KB Created: 2021-06-07 10:17:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 28a4c9322a645fe18ef2f3f822830830 SHA-1: 64941af413766ee0998e5d61c4f7c54f5d130322 SHA-256: 5bcb5c0ca69ecb36757ce7bd8c88e9a1a8b3622a126be3c67ffd4ea2d9f9961a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, masquerading as 'free generators' or 'game hacks' for popular games like Roblox and Coin Master. The primary malicious link identified is https://netcdn.tw/app/431946152/how-to-get-any-hat-in-roblox-no-hack-game-hack, which likely leads to a phishing or malware download page. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/how-to-get-any-hat-in-roblox-no-hack-game-hack PDF link annotation
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-promo-codes-free-robux_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_004_off0000552d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x552D 26036 bytes
SHA-256: 697ba066111e56f23405890d8a2f54dcc6f8cd25dd1c611844c243bfa125b274
font_01_sfnt_off000090bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BB 18628 bytes
SHA-256: d1128c37c26b2334c46c1b9bef34532667ac80fcfd4bb5c07e92909a1ede3a5b

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