Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a217b7459f2142d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 05:41:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fb517c5313333badf865da7b95465221 SHA-1: b3958b640bd7297a8ba3faed53f1ac6533a4ffab SHA-256: 2a217b7459f2142d711a43699478e7ccabe344ff2fc8137d3fce49b41bca1d97
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-risk heuristic firing for linking to a game hack redirector, specifically targeting 'Coin Master Free Spins'. The embedded URL, http://netcdn.tw/app/406889139/coin-master-free-spins-daily-2021-game-hack, is the primary indicator of this lure. While no scripts were extracted, the PDF structure and embedded URI strongly suggest a social engineering tactic to drive users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/coin-master-free-spins-daily-2021-game-hack PDF link annotation
    • http://elibrary.perludem.org//repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/kill-all-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-faces-on-roblox-2021-mac_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-arsenal-free-vip-server-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-items-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hackeando-los-ordenadores-en-roblox-derank_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-become-a-famouse-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/make-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-codes-generator-no-verification_GM431946152.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_002_off00003101.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3101 22828 bytes
SHA-256: bae3a6fb615be09afdc8c31e2bc9385129c53a7ecfa16e7c131714f972b661ca
font_01_sfnt_off000063ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 19000 bytes
SHA-256: b814766d9c7402c53a67f950003b037573ebc2ab6a90739559792a4ced8a8c51

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