Malicious PDF — malware analysis report

Static analysis result for SHA-256 21da4d9df559b7ce…

MALICIOUS

PDF

42.6 KB Created: 2021-05-13 04:03:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b9d5f5df88a6a3365ea8f71e478387e0 SHA-1: 9b44216eb0367ae45ee44024a57f4e7784ee5f80 SHA-256: 21da4d9df559b7ce7a543523d9097ebbc620b334ae6ebbfd3b6fb70007e16967
62 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and text that explicitly promote 'free Robux' and 'game hacks', a common lure for phishing and malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect the user to a download site. The document's content and heuristics indicate a phishing attempt to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/to-get-free-robux-game-hack
    • http://web.smkn1indramayu.sch.id/e-lib/repository/make-free-robux_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/coin-master-working-hack_GM406889139.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/robloxheroxyz-free-robux_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/free-robux-co_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/minecraft-free-online-games_GM479516143.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/free-roblox-gear_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/roblox-bloxburg-hack_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/facebook-coin-master-hack_GM406889139.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/minecraft-cheats-pc-2021_GM479516143.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/robux-hack-generator_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/how-do-you-get-roebucks-for-free_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/minecraft-free-download-chromebook_GM479516143.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/get-free-robux-now_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/coin-master-claim-free-spins_GM406889139.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://web.smkn1indramayu.sch.id/e-lib/repository/coin-master-hack-mobile_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004813.bin
64fd8dfe6b1b0e0e35d232636297ed96e83357d44387d03a6275267baa0f8b4b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4813 27156 bytes
font_01_sfnt_off000084c8.bin
5233d5aad1bcdd77905869674ceee15891b0fc77671f16174d37808cf9f58ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C8 18120 bytes

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