Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e21b71d46fde9b…

MALICIOUS

PDF

45.9 KB Created: 2021-06-08 14:35:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 05f113ab5e9e141daea1c3b5f7c760fd SHA-1: 0d412a70c5a327abf17ebc0043a1c7b2ff882cec SHA-256: e6e21b71d46fde9b6eee0dfd771f1a9582c8bb4f0ae5a8590942718079fe6ae8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux hack' which redirects to a malicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirect URL and the lure strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-robux-hack-that-easy-and-o-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/hex-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/my-roblox-avatar_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_004_off00005459.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5459 25572 bytes
SHA-256: 8a38849ac0a950e31158a3e0f234b68175b610d2f79e3043d4d1bc5cf9910a6e
font_01_sfnt_off00008eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 19036 bytes
SHA-256: c83add60a714b83d5047a3439196e252faacedc9e16e23947031312d7a33fd3d

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