Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14bb7c04ea9282a…

MALICIOUS

PDF

47.5 KB Created: 2021-05-14 14:47:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0f60aa17fb32c7818d37732d62ee54ad SHA-1: d4b9958c499c90fa7406f43475c5e3c30a02b92b SHA-256: f14bb7c04ea9282afb69692c9269af7b9f6fb50f348c7b6473446bed30517865
182 Risk Score

Malware Insights

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

The PDF presents a fake CAPTCHA and instructs the user to paste content into a command-line interface, a common lure for executing malicious commands. The embedded URL and numerous other linked PDFs suggest a phishing or scam campaign, likely aiming to trick users into downloading further malware or revealing sensitive information. No scripts were extracted, but the document's structure and heuristics strongly indicate a user-execution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 6

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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-hack-roblox-game-hack
    • http://www.siahotel.com/userfiles/files/coin-master-free-2021-spin-link-today_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-roblox-hack_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/roblox-2021-hack_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-coin-master-links_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/minecraft-menu_GM479516143.pdf
    • http://www.siahotel.com/userfiles/files/roblox36com-free-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-hack-apk-april-12-2021_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/minecraft-toolbox-premium-apk_GM479516143.pdf
    • http://www.siahotel.com/userfiles/files/free-robux-gift-card_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/how-can-i-get-free-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/websites-to-get-free-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/can-you-hack-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c3f.bin
6d910d181564fb313c2c1481ca6287d174232f5b3f1ec5731d75942d5e9034e6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C3F 27556 bytes
font_01_sfnt_off00008a3b.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3B 3884 bytes
font_02_sfnt_off000096e2.bin
73440050ee62d9c8dc97d7cf0d13859b5ca63a66159f36279ab18a86d0bf293f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E2 18344 bytes

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