Malicious PDF — malware analysis report

Static analysis result for SHA-256 051fbb0a0e00c913…

MALICIOUS

PDF

47.5 KB Created: 2021-06-11 06:15:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2b007285bb5d0ca000336bdb3f6882c0 SHA-1: d2fee232550e399795e73bda553043283578af6d SHA-256: 051fbb0a0e00c9138265dd9332d66a625eb082102176d5342cd72f0992b8173e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document presents a fake CAPTCHA or human verification prompt, a common lure for users seeking game-related cheats or exploits. It contains numerous embedded URLs pointing to sites offering such content, suggesting the primary goal is to trick users into downloading further malicious payloads. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.tw/app/431946152/2021-free-roblox-exploit-safe-game-hack
    • http://lichtdrukkerijwijchen.nl/images/pubg-uc-visa-card_GM1330123889.pdf
    • http://lichtdrukkerijwijchen.nl/images/free-spin-coin-master-online_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-hack-2021-apk_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/oprewards-com-robux_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/roblox-arsenal-hacks-download_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/how-to-get-free-robux-easy-and-no-generators_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-freebies_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/robux-for-surveys_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-card-collection-link_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/how-o-use-cheat-engine-in-roblox-tycoon_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/roblox-jailbreak-hack-script-download_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/cheat-codes-for-roblox-retail-tycoon_GM431946152.pdf
    • http://lichtdrukkerijwijchen.nl/images/minecraft-java-edition-key-free_GM479516143.pdf
    • http://lichtdrukkerijwijchen.nl/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://lichtdrukkerijwijchen.nl/images/free-minecraft-thumbnails_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ca.bin
318ed8d3d6e0cf60a4703b1fc918d77350b60770117a49193898d615f7dc19aa
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CA 24848 bytes
font_01_sfnt_off00008b23.bin
a66b570a908761b39e6d9e18bcb667c353840a86c6a7db528f79d01abe6b23a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B23 2844 bytes
font_02_sfnt_off000094ca.bin
354858e65dbe450807743488221a5c9a34a2250041a4ec1b1f30de57fdc47006
pdf-font-stream PDF embedded font (sfnt) at offset 0x94CA 18980 bytes