Malicious PDF — malware analysis report

Static analysis result for SHA-256 577413e3578796e1…

MALICIOUS

PDF

47.1 KB Created: 2021-05-16 11:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fb95be9163fc40d9f0b1d085bec6fd04 SHA-1: 5dccec98a70bfc61eee39a5b2dce085b38304ae3 SHA-256: 577413e3578796e129acba50489e9b6865ac07de5e54b0a98a944064c9e2b1d8
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which point to SEO-optimized PDF files related to game hacks and free currency. The primary URL, https://netcdn.xyz/app/431946152/how-to-buy-robux-for-free-game-hack, suggests a scam or phishing attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-buy-robux-for-free-game-hack
    • http://kita-sunshine.de/images/coin-master-daily-free-spins-25_GM406889139.pdf
    • http://kita-sunshine.de/images/coin-master-free-spins-link-app-download_GM406889139.pdf
    • http://kita-sunshine.de/images/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://kita-sunshine.de/images/op-rewards-robux_GM431946152.pdf
    • http://kita-sunshine.de/images/coin-master-hack-quora_GM406889139.pdf
    • http://kita-sunshine.de/images/coin-master-hack-https-coinms-net_GM406889139.pdf
    • http://kita-sunshine.de/images/earn-free-spins-coin-master_GM406889139.pdf
    • http://kita-sunshine.de/images/robux-generators-that-actually-work_GM431946152.pdf
    • http://kita-sunshine.de/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://kita-sunshine.de/images/free-coin-master-cheats_GM406889139.pdf
    • http://kita-sunshine.de/images/free-executor-roblox_GM431946152.pdf
    • http://kita-sunshine.de/images/how-to-get-free-robux-app_GM431946152.pdf
    • http://kita-sunshine.de/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://kita-sunshine.de/images/coin-master-free-spins-link-today_GM406889139.pdf
    • http://kita-sunshine.de/images/free-robux-no-apps_GM431946152.pdf
    • http://kita-sunshine.de/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://kita-sunshine.de/images/minecraft-free-download-mac-full-version-2021_GM479516143.pdf
    • http://kita-sunshine.de/images/coin-master-hack-no-human-verification-2021_GM406889139.pdf
    • http://kita-sunshine.de/images/coin-master-free-spins-for-today_GM406889139.pdf
    • http://kita-sunshine.de/images/hacks-for-coin-master_GM406889139.pdf
    • https://rblx.land
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b01.bin
fd4a26af9522eba0ed7122213419f84710a19852867a8bd2db5b6a7ece8376c4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B01 26672 bytes
font_01_sfnt_off0000887b.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887B 5696 bytes
font_02_sfnt_off0000958d.bin
42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958D 18356 bytes

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