Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e556fd94dc65b1…

MALICIOUS

PDF

53.7 KB Created: 2021-06-03 08:34:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 06b25f3220b65a440cd9a40fd4ea6bbd SHA-1: 14e2dea37cf63029dc4784e53bcf7dffaef9fe08 SHA-256: 78e556fd94dc65b19d93d401183a8284038197b1aaf1e09c6d5aba7b1df7267b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9636

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/arsenal-hacks-roblox-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-offers_GM431946152.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_off00005308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5308 33916 bytes
SHA-256: c60fc7ef2b9ea37a1b8b303c4deeb48065fb2eb221bbb8b59ae48e07d71152b4
font_01_sfnt_off0000a2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A1 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000afb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB2 18184 bytes
SHA-256: a3c2357e5f06b76da12fb87e71b44d24867f9c5d578f41f931a6caf721fbec94

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