Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fbcfb113b147d9…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 11:41:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 376701643127512f5824c5fd063319e0 SHA-1: cad742d732322162c8adc2ad78664c72557f32df SHA-256: 90fbcfb113b147d95a87d21ad07acf9fd231bfa8674b1bbf4ab17b54a7bc6bf0
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'free generator / game hack' and displays a fake CAPTCHA to trick users into interacting with the content. It embeds multiple URLs, with https://netcdn.xyz/app/431946152/earn-robux-today-game-hack being the most prominent, likely leading to a malicious download or exploit. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/earn-robux-today-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-2021-apk-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_003_off00004be1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE1 26084 bytes
SHA-256: b60cf5d82fbfe9a7ae51e3065ad56fe16bf5ab373eff0f610666714067d450c9
font_01_sfnt_off00008858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8858 18432 bytes
SHA-256: 50fc1adeb895ae30588f73a493889120d8bf728fc3821c38df9289c33b75de2a

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