Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7f9fd3b05b2adf…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 20:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f9fac12e7895071db1b80b35fee2e1fe SHA-1: a9e20068a8d6c86db6111e50940d2aadf0f81e61 SHA-256: aa7f9fd3b05b2adf5286746057133ad4c796354760668b987d335699542df392
200 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to entice users to click on a link, which redirects to malicious infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving users to potentially malicious content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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
  • 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-roblox-followers-generator-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/www-rubux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hackear-juego-coin-master_GM406889139.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
stream_004_off00005325.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5325 30860 bytes
SHA-256: 42b7b60fa5ee12fbe9556a81adb24bb375493fdf8452ab6528bd8052356c01cf
font_01_sfnt_off00009761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9761 18444 bytes
SHA-256: 85a3bc75163aa5cb550fcd7f623674911054c132152be1c6daf8752df38f0070

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