Malicious PDF — malware analysis report

Static analysis result for SHA-256 7919f8cec30e5ccc…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 07:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 84aa89b056e38bc70a97fa6a3eb9b8b4 SHA-1: 2e3b12349dcaa87bdb9648729c36ab73dd3ed64f SHA-256: 7919f8cec30e5ccc1cb4682fa825ba9090b6026c5b5edf10b619726916f5f7b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking a link that leads to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-dll-scripts-for-roblox-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/free-robux-obby-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E71 24224 bytes
SHA-256: 15340dfe12f222c703b70aeb45e71c77525d74ed415874cfdfea27f46a7c5aed
font_01_sfnt_off000084f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F1 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA3 18516 bytes
SHA-256: 0b0ecf39efc41456e434f02cedbfece1943af831fad181e6aff870b9e1795845

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