Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5ae1e1d0280b6b…

MALICIOUS

PDF

47.1 KB Created: 2021-06-07 15:08:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00f983bce765771b7d15835b2c692752 SHA-1: 099ef225a73a8a825ed2e6804036b01f80943223 SHA-256: fd5ae1e1d0280b6be11636ee40f3ea93cdeb29c1030ae8131715b9b42d334b03
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, a common social engineering tactic. It contains multiple embedded URLs, one of which is directly referenced in the document body, suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/how-to-get-50-robux-free-game-hack
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-ios-hack_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/roblox-inappropriate-games_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/pubg-mobile-74-uc_GM1330123889.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/games-to-get-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/coin-master-claim-spins_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-hack-fast-org_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-do-you-get-roblox-money_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/cute-free-stuff-on-roblox_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/free-robux-roblox-promo-codes_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-spins-and-coins-com_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/send-me-500-2021-spins_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/roblox-redeem-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/coin-master-free-spins-2-5-2021_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/minecraft-hack-download_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-make-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/where-tiktok-free-views-and-likes_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055aa.bin
673b3ec4cd3d956af94f1240883363aba3287785ac4849c294af2cc4faa2ab5d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55AA 28084 bytes
font_01_sfnt_off000094b1.bin
be08576bf07943caad54e2a2ddde37e9003a9787bd5e4f45a067198a77eebb3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 18588 bytes

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