Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f8829b98e32199…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 22:48:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: dcdbfb2174199a57c73d4d041a4a294e SHA-1: 82c9b40bada8ea26bb56600c88438d3478b4a02b SHA-256: 83f8829b98e3219944890dc4799b02ea1408b6353a5bf69e61a17ae972353c57
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free currency, directing users to a known malicious redirector. This redirector, in turn, hosts numerous other PDFs that likely continue the chain of malicious redirection or payload delivery. The document body and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-2021k-robux-no-password-obby-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-script_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-with-the-command-prompt-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/fly-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-create-clan-in-roblox-for-free-account_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/probloxicu-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-coin-master-spins-free_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
font_00_sfnt_off00002ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF2 21648 bytes
SHA-256: 356fce51ebbfb6ac5791e236f40d00bef711b7117f756909043681096dc4809b
font_01_sfnt_off00005e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E76 19960 bytes
SHA-256: a7ae8aab3900524c68967a8b3cefca6765b9d5a65045061a968a1b16014a6a24

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