Malicious PDF — malware analysis report

Static analysis result for SHA-256 08de88fe6bed1705…

MALICIOUS

PDF

46.5 KB Created: 2021-06-07 12:23:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e5e5a43109b82bfc078a43b6e3a8d1ed SHA-1: 1e262aba4187eb2cce61c856a58b83179be691a4 SHA-256: 08de88fe6bed1705721dddd29e0af4765bdb39b44786ecb5ccdc9194eb1b5d78
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA or human verification prompt to trick users into interacting with malicious links. The embedded URLs and document body content strongly suggest a lure for free in-game items or currency, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external URI findings indicate a high likelihood of malicious link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/roblox-how-to-get-free-limited-items-game-hack PDF link annotation
    • http://schmittmusic.de/images/_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/dailyrobux_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://schmittmusic.de/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://schmittmusic.de/images/http-roblox-hack-mobilegenerator-net_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://schmittmusic.de/images/how-you-get-free-robux_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_off00004d69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D69 25980 bytes
SHA-256: 0c01586ab00412487881fe240a901ca5e7e31f22fa44fcd04d369f7e33a1d0b7
font_01_sfnt_off000087a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9163 18772 bytes
SHA-256: 4fcfc04c279b7f610a026ffdb802da1bc9cf357c4932813a59128daf39705f3b

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