Malicious PDF — malware analysis report

Static analysis result for SHA-256 9559cbc02755bc01…

MALICIOUS

PDF

44.1 KB Created: 2021-06-04 00:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e363e221a7f5e79fcd624c46f000c1ee SHA-1: 9d27a240673c78d05678641f43d82100b4f04766 SHA-256: 9559cbc02755bc019d5389f777247b8920377c31383812919320309432d74096
122 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and presents a fake CAPTCHA to trick the user into interacting with the document. It embeds multiple URLs, including one pointing to a 'free-robux-youtube-game-hack' page, suggesting the document's purpose is to redirect users to a site that likely hosts a malicious payload or further phishing attempts. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-youtube-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEE 25976 bytes
SHA-256: 6aeeaf2daa42bc346e019fa1630ce15bf80c9c17c666c38e5a1cfcbec2ec4759
font_01_sfnt_off000089b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B8 18280 bytes
SHA-256: de5b074060e7ee0fa0230ac6212805924cd4a5679e09505111534b28358c176b

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