Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c55a455cb63eb3…

MALICIOUS

PDF

45.4 KB Created: 2021-06-08 23:53:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f80218deb23e763aec1b6811b4289e4f SHA-1: c0999fc8f5fcee0c1c67114aec9923cb1a51a614 SHA-256: d4c55a455cb63eb35faeaab04cf8b4ee5d1ac44a83afd38e390fcc9962fda53d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacks and free currency, directing users to a malicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate a phishing attempt designed to redirect users to potentially harmful content.

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/how-do-u-get-free-robux-on-roblox-2021-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/when-tiktok-free-download_GM835599320.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-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_off0000522b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522B 25052 bytes
SHA-256: b8d17c9ddac7acf0f3a990b8b345e4a91bcccda710d8c48d0190b9198cb556d0
font_01_sfnt_off00008c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2F 19112 bytes
SHA-256: c0854e00225ff777290c8fad2d5e2698e06201b7d076ada94afc712e03a5f3ee

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