Malicious PDF — malware analysis report

Static analysis result for SHA-256 647cf5fd9d9ccff8…

MALICIOUS

PDF

43.9 KB Created: 2021-06-04 02:36:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 016bab725daa36bb4a0398c7bc5f1de0 SHA-1: c964e1ef2f9bca479f089ffba80823ca8f4ab32b SHA-256: 647cf5fd9d9ccff8d676c29f6f3b22122f8e623fb0a5f55269bdd6384122e602
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 0.9865

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/worst-roblox-avatars-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-500-spins-link_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
font_00_sfnt_off0000506f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x506F 24220 bytes
SHA-256: be90a294cc2c9d0d33f434166fa91c188308a853a013d945516a7cd5695909f8
font_01_sfnt_off0000881b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 18428 bytes
SHA-256: 6ace7b5324c956ccbfd05766e740bf26877bde50396ed9b1cb0e10f1ff81d407

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