Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aee2417a33addf…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 04:25:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a914571c5865d5c13502e73916b76e96 SHA-1: d491d60d7d1f90cf0ce6c7d4aaee8f99ed1ae895 SHA-256: e4aee2417a33addf7a65471bf55670f271d693e472540405bd0c3e35b119a50f
122 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 link to a 'free generator / game hack' lure, indicating a social engineering attempt to trick users into visiting a malicious site. The embedded URL, https://netcdn.online/app/431946152/bux-gg-robux-free-game-hack, is the primary indicator of this malicious intent. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user curiosity for potentially harmful actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/bux-gg-robux-free-game-hack PDF link annotation
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/play-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-hack-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000514c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514C 24840 bytes
SHA-256: 22be4479d9f6a4a8bde4e1e5f0c29057d0445c450c1b64849e350f3bb7c7d595
font_01_sfnt_off00008a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A31 18304 bytes
SHA-256: 8d8733a7c40ec122fa0656e79a44d71687d26648648a8c1fb15c9a660e1bc95a

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