Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ee5b797e00144b…

MALICIOUS

PDF

50.2 KB Created: 2021-06-03 14:11:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 82d83e7c14d005a68d43ce5248652e68 SHA-1: 7762e4cd69d04d7b7c80d1da1b2e845801a52d6d SHA-256: 77ee5b797e00144bfc8a1c9e9d9544e2e96d38417a4d68b25c8d1357bdddbb16
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a download lure, directing users to a URL that promises free Robux. This is a common social engineering tactic to trick users into downloading malware. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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.online/app/431946152/freerobuxhack-us-2021-game-hack
    • http://perpus.smkn1pemangkat.sch.id//repository/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-earn-free-robux_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/hackear-coin-master-sin-verificacion_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-download-for-pc_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/wurst-112_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/free-robux-instantly_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/my-minecraft-account-was-hacked_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/minecraft-hacked-apk_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/oprewards-points-generator_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-card-link-coin-master_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-live_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/minecraft-xbox-free_GM479516143.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/best-way-to-get-free-robux_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-spins-coinmaster_GM406889139.pdf
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-websites-that-work_GM431946152.pdf
    • http://perpus.smkn1pemangkat.sch.id//repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000536b.bin
2ed9a6c1d63b06f7e5bb3106853848b7e79a04447a0710f4c3f0a675597288b8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536B 26876 bytes
font_01_sfnt_off000091db.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91DB 5696 bytes
font_02_sfnt_off00009eed.bin
efb3faf8613e574aaafbc2c03eecac9d279c27a31d34e4d9725215b9c75db868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EED 19168 bytes

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