Malicious PDF — malware analysis report

Static analysis result for SHA-256 837c5b27e37b30b6…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 23:32:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3c9fa80d83ef4d30c9a25fe15d406d01 SHA-1: 606ff0803aa5705f58e133719f72644f616ee5aa SHA-256: 837c5b27e37b30b6cf648492df792cec1fee79ef56703a5ca78c0df1800f2187
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that are designed to lure users into clicking on them by promising game hacks and free in-game currency. The primary URL, 'https://netcdn.online/app/406889139/coin-master-free-spins-hack-game-hack', is flagged as a game hack redirector. While no scripts were extracted, the presence of these lures and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-hack-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-page_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/easy-robux-today_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_off000051b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B3 24780 bytes
SHA-256: dedbc982be7b3ed3059f96c2614ea58192725814dec5d555960e579302f2efa5
font_01_sfnt_off00008a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A83 18056 bytes
SHA-256: 5bc30252b20e252a4e4f12754ee6fd7a8bdc905346c0352a18cf9aa56584dd16

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