Malicious PDF — malware analysis report

Static analysis result for SHA-256 535acc0a1298d613…

MALICIOUS

PDF

44.1 KB Created: 2021-05-17 15:36:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 622f08eb1edc0e75dd66fa119a5962af SHA-1: 7c6f73ca755dc32409d7cff78b0efbe5b5889483 SHA-256: 535acc0a1298d613d4c908a0370d3254a83954a4543ab00e1808028b146eacef
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, likely to trick the user into clicking the embedded URL. The primary URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-chromebook-game-hack, is suspicious and suggests a lure for game-related cheats or hacks. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-get-free-robux-on-chromebook-game-hack
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/coin-master-tips_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/coin-master-hack-app-2021_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/www-coinmaster-com_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/minecraft-com-free_GM479516143.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/wahoogaming-co-free-robux_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/roblox-hacked-version_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-roblox-girl-clothes_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-spin-coin-master-game_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-apk-download_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-robux-ad_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/minecraft-free-app_GM479516143.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/free-spin-coin-master-link-download_GM406889139.pdf
    • http://www.elearning.man2bandung.sch.id/__statics/gudangsoal/files/roblox-free-clothes-girl_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00005151.bin
d9dbc1d03f9d8d2e82086d60f56158446ede62f38514a731f3ea3f1a01a45a9b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5151 24412 bytes
font_01_sfnt_off00008872.bin
cfbdee24d7402b99052158ce8ccd316620959aaec27a5d82eaae160d81e49f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8872 18880 bytes

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