Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b7b57efb95784…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 22:53:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1b35741767ce4e2ca00f5173a9e94780 SHA-1: bc50ba915202ddbe6a3db53efbed6c7f1838368a SHA-256: 623b7b57efb9578401558be49be9b97eaa859af3f2e9724c35f2b97988e6857c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 malicious score 0.9769

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.online/app/406889139/coin-master-hack-unlimited-spins-apk-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-pubg-uc-transfer_GM1330123889.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000519e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519E 24644 bytes
SHA-256: 70782e50dcc17f2c63f5a137e0a21db12ac0e11831b2ce7657af6d72d3c5f5c1
font_01_sfnt_off00008a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 2944 bytes
SHA-256: a0301b7f2c576e4a889a11eed4f4f7770c47239120b218cd3fd1d2cb36c2aaf5
font_02_sfnt_off0000946c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x946C 18584 bytes
SHA-256: 7ab6b6a2534dd61b41f41af0d2c6fad32de5c170167a104ad22e4ca4b978dbf2

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