Malicious PDF — malware analysis report

Static analysis result for SHA-256 4311a183501fb5b4…

MALICIOUS

PDF

45.8 KB Created: 2021-05-16 12:54:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 77b4446ece05872af2e7fab1dc173fc5 SHA-1: aa4e8fd1368900a90e0bdb586c858d33de0e7ce6 SHA-256: 4311a183501fb5b48b1bf34248908eff2d18d3303e1a32dd076d21f6e8bbb05c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document displays a fake CAPTCHA or human verification prompt, a common lure for users seeking free game items. It contains numerous embedded URLs, including one pointing to 'robux-free-c-game-hack', 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 0.9432

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.xyz/app/431946152/robux-free-c-game-hack PDF link annotation
    • http://danielkleiboemer.de/images/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://danielkleiboemer.de/images/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://danielkleiboemer.de/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://danielkleiboemer.de/images/robux-come_GM431946152.pdfIn PDF document text
    • http://danielkleiboemer.de/images/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://danielkleiboemer.de/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://danielkleiboemer.de/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://danielkleiboemer.de/images/free-robux-cards_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_003_off000047ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47EA 25720 bytes
SHA-256: de0e5d31188c5c7160b42abbb97804ac778d13b6a215e4caa87b257650d1afc0
font_01_sfnt_off000083e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E3 5756 bytes
SHA-256: 400ee760d8ba2af4a989a89998a708334648619bc88f048e6e7319998473a993
font_02_sfnt_off00009138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9138 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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