Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89b467cbea1c297…

MALICIOUS

PDF

53.3 KB Created: 2021-06-13 17:20:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7ed2b0b13b588dd534f9ef38ac301169 SHA-1: 0b90951a9bd8214bb4daaace7c2bd88a17885da6 SHA-256: b89b467cbea1c297935a1961d3c74dba7f2d9af75a488b3fde3b9b69f94c6d79
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector. The embedded URL, http://netcdn.co/app/431946152/boku-no-roblox-legendary-hack-game-hack, is presented as a lure for game cheats. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a social engineering tactic to drive users to a potentially malicious site, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 4

  • 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.
  • 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/boku-no-roblox-legendary-hack-game-hack PDF link annotation
    • http://pustaka.ust.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-domino-crown_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-shirt-roblox-marmelllo_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-make-a-shirt-on-roblox-2021-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-for-coin-master-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_off000053d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D2 39756 bytes
SHA-256: 56880786975808f164ec2885ef0607792984c97e6131a36bc29ada86f0338b9f
font_01_sfnt_off0000ac2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2F 18964 bytes
SHA-256: 9003c4b02c194fff97b384f347654ad5d4e6a750a44977f1d0e0bc1a2db44fbb

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