Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a331453aa811dbe…

MALICIOUS

PDF

44.6 KB Created: 2021-06-13 22:10:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f5f562ee4b4b3eac190f38fdf4a8227 SHA-1: f41e49e7e87fe6cc80679980b273ca980a1554c3 SHA-256: 8a331453aa811dbe150d0175f9b1d29f982569f36bff32a03ff5b76faefd1a85
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into performing an action. It also embeds an external URI pointing to a suspicious URL, likely intended to host or deliver a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/robux-free-com-game-hack
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/roblox-cheat-robux-generator_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/free-followers-for-tiktok_GM835599320.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/huskybuckscom-free-robux_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/free-tiktok-views_GM835599320.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/get-free-robux-generator_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/minecraft-building-hacks_GM479516143.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/how-to-download-hacks-roblox-jailbreak_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/minecraft-hacks-115-2_GM479516143.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/roblox-command-cheats_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/auto-jump-hack-roblox_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/free-accessories-for-roblox_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/roblox-coding-classes-free_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/nike-shirt-roblox-free_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/hack-download-mega-innovation-roblox_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/minecraft-hacked-client-112-2_GM479516143.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/aimbot-hack-roblox-rb-world-2_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsnkotajayapura.sch.id/__statics/gudangsoal/files/how-to-get-50k-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d9e.bin
ad56ced338e02e7a9c60361a0401e307fc912c9d6bdf2d3f05cb8342ae7526f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9E 27120 bytes
font_01_sfnt_off00008c42.bin
0fd65c317a1abc649e3faff400e4768e1aa7d1dd6ac5589c15474ffa47aab2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C42 18276 bytes

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