Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3855c1da9af060…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 21:13:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f21e0a562953b3a72a6fe51fe747618 SHA-1: 13d95e071c59d013a29b805bc0b643a95650f9f4 SHA-256: cd3855c1da9af0602d648033f04bd8abdaaa1876e3178fa5862e5fc715dc93e5
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 0.9864

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.tw/app/431946152/games-that-give-free-robux-on-roblox-game-hack PDF link annotation
    • http://digilib-pps.unja.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-shirts-and-pants-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.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_off00005378.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5378 25464 bytes
SHA-256: 461bcd716e606215004fd93385133d9d9b1e906a95cd2ebd394a0a8ec9b74422
font_01_sfnt_off00008ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA5 19080 bytes
SHA-256: 97e686bca68f321eef150908c31d535f1f55810aa81c16f914a6389ad3688fe6

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