Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb657a993466734…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 03:52:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b2d169cf1a9c8597c7d4adc14e26f2b4 SHA-1: ed3f5f85701b48049a51478d71410d0c2883379d SHA-256: ddb657a9934667347b3e497b22d5eabe29f6b079a282a0b184e9666ce7d050e1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector. The embedded URL, http://netcdn.tw/app/406889139/open-coin-master-game-hack, likely leads to a malicious site. The document body, though partially corrupted, also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious.

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/open-coin-master-game-hack PDF link annotation
    • http://fkunismuh.org/perpustakaan/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-game-that-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-injectors-list_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/redeem-credit-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/release-boku-no-roblox-remastered-free-lvl_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-hack-rar_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-ps3-free-download_GM479516143.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_off000036f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36F2 22788 bytes
SHA-256: 50cfc600fb9e8d5278aec273d3ee668d1a4dec8ad600ac3e6d79d63d3361fc4c
font_01_sfnt_off00006a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 18008 bytes
SHA-256: 01b2d26e5667a3b5a50f75626f975bd6982cd8afb945009ae254d5a27d36e96c

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