Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3ebf2bf374647b…

MALICIOUS

PDF

32.0 KB Created: 2021-07-03 16:17:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5ed3cabf7ab9aaa60b6e02dfa4a6cbf1 SHA-1: 52c6ac9cc9b83819546ed5c2dc78e19790295ee8 SHA-256: ed3ebf2bf374647bf7c316629aaad431804e54bdb02061c8f07c1d5d7ea524a4
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a prominent call-to-action for a 'Robux generator'. The primary URL, http://netcdn.tw/app/431946152/gain-robux-game-hack, is flagged as a game hack redirector, indicating a likely phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness, supporting the assessment of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/gain-robux-game-hack PDF link annotation
    • http://www.eucorro.com/arquivos/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-hack-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/lumber-tycoon-2-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-codes-may-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-apk-free-download-016-0_GM479516143.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_off000029d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D9 21528 bytes
SHA-256: 66c81ed9784d3dd7a90e090cfd718ef75f9a41c7c25d667ebbe972862877e7e7
font_01_sfnt_off00005937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5937 18672 bytes
SHA-256: c80488855d2dce79205e485caf841cdd4be57ea4b0e2695af8b913eb79d7bdb3

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