Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc3ec5b863143e…

MALICIOUS

PDF

50.0 KB Created: 2021-05-12 02:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5eb24d5dba33a28f8ed526d1cb581cc4 SHA-1: 6af4f814cbdfaf76a2e94d8bb80a68ebc86530a0 SHA-256: cadc3ec5b863143e3bf7a87811d7fa220f4437534743b7dc007fdd896368cb94
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, likely leading to the download of a second-stage payload from the embedded URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs further supports this. No scripts were extracted, but the document's structure and heuristics point to a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.xyz/app/431946152/roblox-hack-me-game-hack
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-com_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-on-ipad_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/robux-without-verification_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/download-coin-master-hack-mod-apk_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/114-hacks_GM479516143.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-date-and-time-hack_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/game-hack-coin-master_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/gamehunters-club-coin-master_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-hack-coins_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/claim-coin-master-free-spins_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/coin-master-online_GM406889139.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/rbx-free_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/get-free-robux-com_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/free-roblox-glasses_GM431946152.pdf
    • https://elearning.min5bandarlampung.sch.id/__statics/gudangsoal/files/easy-way-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004fe5.bin
ded0d8a058e5ba3cc1a8ed98653596933e6d64d9af0103ff2cf9ce25b8c1adac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE5 36984 bytes
font_01_sfnt_off0000a1a4.bin
aef395c884b1121fa113f915db4056a7b0027cd471dc4d96a5cdd03c50f60cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A4 18376 bytes

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