Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21fdd2009646b5d…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 09:01:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 66c0385756a2013491cfc49d13c8a597 SHA-1: aadc971c9c44dbc1767f7237123202cb4995e194 SHA-256: e21fdd2009646b5dc28bb29227d60969168647850d91c16c3aa2989a415ccf3c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The document presents itself as a "Free Robux Generator" and contains a lure to execute commands in a shell context, likely to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs further supports this assessment. The document body and embedded URLs suggest a scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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
  • 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/free-robux-generator-no-survey-no-download-no-human-verification-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47E9 24532 bytes
SHA-256: 5bd5541cc8f8190dc65af1012d98e3930b96a6e6e619687123c63f5967b1d21b
font_01_sfnt_off00008098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8098 19736 bytes
SHA-256: 3cea6d4f9da734904bcc55369e0b79f4621aa36195ab65246c463812034b9480

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