Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff4be9e4a0dbe2…

MALICIOUS

PDF

32.6 KB Created: 2021-07-07 14:04:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 52eba8c85f031917c1834eee0451f9a7 SHA-1: 4332edc86541c5b39234c9a8903fd3fc2d9bad43 SHA-256: 0cff4be9e4a0dbe22f9736aa7799fa4a2e2bd29b5ed70161e74825a5b5e342fa
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link to a website offering 'robux-no-verification-game-hack', a common lure for users seeking cheats or generators for popular games. This heuristic, combined with the ML classifier's high confidence, strongly suggests a malicious intent to redirect users to potentially harmful content or download sites. No scripts were extracted, but the embedded URL is the primary indicator of the attack.

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/robux-no-verification-game-hack PDF link annotation
    • https://elearning.madhpku.com/__statics/gudangsoal/files/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-get-free-obc-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-hacks-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/how-to-hack-money-in-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-spiderman-package-full-suit-free_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-jailbreak-airdrop-hack_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/free-robux-no-human-verification-or-password-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/roblox-jailbreak-speed-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.madhpku.com/__statics/gudangsoal/files/coin-master-free-spins-whatsapp-link_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
font_00_sfnt_off00002b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2F 21716 bytes
SHA-256: 1e44f8aa99fc3e1f04c6891de6ff25ad1d8e0fe1a6df06a7ecb823726cc660ef
font_01_sfnt_off00005ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE0 18912 bytes
SHA-256: 5371eeb4f32645909a106e2314d3e19630680129b8a7356391e2a50deb7f8a6b

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