Malicious PDF — malware analysis report

Static analysis result for SHA-256 41de0bffc39bb2cc…

MALICIOUS

PDF

52.7 KB Created: 2021-06-03 23:55:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b38d7fc6576fb8a649374e305bf6ce39 SHA-1: 8abbd65f5b3411a22de60865b69a59d2609ab49a SHA-256: 41de0bffc39bb2cc82d53b2d2d20926028c1144a69ed6046168ddbbc1d893226
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks and free currency, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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/431946152/redeem-roblox-card-free-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/pokemon-go-5-free-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000529c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529C 24904 bytes
SHA-256: b38bf8a7a33a29fe89d7ab5495b741f39a02b602a2a5371607d8e3c5c7eee458
font_01_sfnt_off00008bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off0000987a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987A 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_03_sfnt_off0000aa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5D 18612 bytes
SHA-256: 60f5a1d5a0775e45587e850c673dfad554e932795a56f36892a7298ffe0bc887

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