Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4a46ca2069a8b5…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 12:58:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 09e798f002c63461e6437feebc29b209 SHA-1: d5d6b5f27733d7ff9b1337a15052193cdc74a8d0 SHA-256: 2a4a46ca2069a8b50e3dc19083efe98bda980fb4de960a1ae136bc90b9bb1f04
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/claimrbx-free-robux-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hack-game-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-game-for-pc-free-download_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
stream_004_off00004df1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF1 24768 bytes
SHA-256: 612bc3c57d3a0b6eb1c1106840e2da20842b671718736d0f528db40a8fa7161c
font_01_sfnt_off000086ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 18696 bytes
SHA-256: cfa2fb642045145230a20b139508f2677ace4dfe3e3be0c8823c50af7163445a

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