Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b27ab4a8e14dbbe…

MALICIOUS

PDF

37.1 KB Created: 2021-07-08 05:39:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 047e4afdd110d8aaf6d207cba5d5c3a0 SHA-1: ead93d39a129b263af1dbe86ce799c30a8063716 SHA-256: 4b27ab4a8e14dbbe1475ba9b31f7c05ab1917747805a5fe78af803dd27fda9a5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple invisible links and explicit calls-to-action disguised as game hacks and CAPTCHA bypass lures. These links redirect to external URLs, including known malicious redirectors, aiming to lead the user to potentially harmful content or further compromise. The ML classifier strongly indicated maliciousness, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.tw/app/406889139/coin-master-hack-no-survey-or-verification-game-hack In PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/works-how-to-get-free-robux-2021-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-hack-in-roblox-without-recaptcha_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-use-grab-knife-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-lumber-tycoon-2-hack-windows-6_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-coin_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/tiktok-free-fans-and-likes-app_GM835599320.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/tiktok-free-liker_GM835599320.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-codes-for-roblox-laser-knife-for-twisted-murderer_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/cheat-mine-simulateur-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/robux-hack-real-one_GM431946152.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_off00003a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A1B 22940 bytes
SHA-256: e04a80bbe5251a354e70c6d6488446c62b3a2c02ddcb06a9cbb75d78d56aa8eb
font_01_sfnt_off00006d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D95 18572 bytes
SHA-256: 3714ff820157558559e7d0653201827560acd429746c0784f855fbf1e368d380

Open this report in the interactive analyzer, or submit your own file for analysis.