Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f48fe74c67595b4…

MALICIOUS

PDF

44.0 KB Created: 2021-06-08 14:19:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 59f145e3ae4ba60e6d41723e818c5bf7 SHA-1: 3a8184730e39ece5fff0f0a96c25cad98835e118 SHA-256: 9f48fe74c67595b442ec8ed7beb411f4195e358683a4074a56ee72250a1db78e
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, encouraging users to click a link for 'free Robux'. The embedded URL and multiple other URLs point to suspicious domains, likely serving as part of a phishing or scam campaign. The ML classifier also flagged this PDF as malicious, reinforcing the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-free-robux-2021-game-hack
    • http://bogatyr.com/images/how-can-i-get-free-robux_GM431946152.pdf
    • http://bogatyr.com/images/roblox-accounts-for-sale-free_GM431946152.pdf
    • http://bogatyr.com/images/robux-match_GM431946152.pdf
    • http://bogatyr.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://bogatyr.com/images/how-to-get-a-refund-on-roblox-2021_GM431946152.pdf
    • http://bogatyr.com/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdf
    • http://bogatyr.com/images/roblox-online-free-no-download_GM431946152.pdf
    • http://bogatyr.com/images/free-tiktok-followers-instantly_GM835599320.pdf
    • http://bogatyr.com/images/microsoft-robux_GM431946152.pdf
    • http://bogatyr.com/images/hack-coin-master-apk-31_GM406889139.pdf
    • http://bogatyr.com/images/pokemon-go-free-download_GM1094591345.pdf
    • http://bogatyr.com/images/how-can-you-get-free-robux_GM431946152.pdf
    • http://bogatyr.com/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://bogatyr.com/images/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://bogatyr.com/images/rbl-gg-free-robux_GM431946152.pdf
    • http://bogatyr.com/images/wayfort-alpha-free-money-roblox_GM431946152.pdf
    • http://bogatyr.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://bogatyr.com/images/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://bogatyr.com/images/free-roblox-hack-us_GM431946152.pdf
    • http://bogatyr.com/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004db0.bin
4734459b24542bf1c9756fdd49e885a7e6321c3c2df79415e7dc92f11da04d91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB0 25216 bytes
font_01_sfnt_off00008873.bin
a3208fce9527d2278c234a1a61d28fcd25fb7af8e8cbd61a3e8613f4dc1586fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8873 18488 bytes

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