Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1c17b3375d41bd…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 11:20:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b648fd79c60b560d16c97707335c4693 SHA-1: 5898fab11af4f5c39044a5f5594649c192f1c721 SHA-256: 2b1c17b3375d41bd7382cd453370b1af38c99c704b9dc19139891daed5be1831
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to download free Robux, strongly indicating a lure for malicious content. The embedded URL, http://netcdn.tw/app/431946152/promo-codes-for-free-robux-game-hack, likely serves as the initial download or redirection point for a second-stage payload. No scripts were extracted from this sample.

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.tw/app/431946152/promo-codes-for-free-robux-game-hack
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/free-robux-website_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/gud-info-robux-free_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/claim-coin-master-free-spins_GM406889139.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/windows-10-minecraft-hacks_GM479516143.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/my-roblox-account-was-hacked_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification-2021-pc_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-easy-steps_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/greenville-roblox-hacks_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/free-robux-surveytool_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-with-lucky-patcher_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/how-to-get-free-animation-in-roblox_GM431946152.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdf
    • https://elearning.mtsalmuhajirindps.sch.id/__statics/gudangsoal/files/minecraft-reach-hack_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031ae.bin
e75c30b18fb4ed742ea7ea22b39c956c4a3547c939d1749e57caed33ef8d78ca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31AE 21776 bytes
font_01_sfnt_off000061bb.bin
8f108eb77a448bab32907087749351f9dfb7449b9cf832684ec1eb90d477be7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 19304 bytes

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