Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daff00722ebdc61…

MALICIOUS

PDF

48.0 KB Created: 2021-06-03 20:36:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a0cdee397400c54d9722c295e171751e SHA-1: 6376985fba84f31ca64b83125343c780173a4b01 SHA-256: 9daff00722ebdc6172abb7689a48d8bedc3607e3dc72bd8fdc029043c5eaad6e
122 Risk Score

Malware Insights

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

The PDF file contains a heuristic match for a fake CAPTCHA or human verification lure, designed to trick users into clicking a link. The embedded URL, https://netcdn.online/app/431946152/robux-generator-without-verification-game-hack, is presented as a 'robux generator without verification', aligning with common phishing and scam tactics. The document's structure and content suggest it is intended as a spearphishing attachment to deliver users to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/robux-generator-without-verification-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-hack-no-human-verification_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_off0000516a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516A 26676 bytes
SHA-256: 53663a8540596f48d77b05cf035a5980c5a09a6ff8800770e46d77b2470e714b
font_01_sfnt_off00008d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9716 18800 bytes
SHA-256: 7a1699424a486bcfa4df415b867af9f99e06be81e984b6abcb7de7a1603b39ab

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