Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e08dbe139b35d3c…

MALICIOUS

PDF

41.5 KB Created: 2021-05-15 06:40:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 69dead76a4c8367bb854f352b4e6fcd0 SHA-1: b91099eccd8c5ba46fb099abcba85b2c02d53169 SHA-256: 3e08dbe139b35d3c37ece86ec6b61f2802b89ca3887b7f74b4ae897c01e7e7f5
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as 'game hacks' or 'free generators'. The embedded URLs lead to known malicious redirectors and host further PDF documents, suggesting a multi-stage download or redirection scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-free-spin-link-app-game-hack In PDF document text
    • http://yogaschooldecypres.be/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/robux-match_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/getrobux-now_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/robux-adder_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/how-to-change-roblox-name-for-free_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
stream_003_off000049e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E2 23912 bytes
SHA-256: 78d3c6dc9bda1f6316977a185e6fd54117b7792c976b07639878a2bb38ff0e46
font_01_sfnt_off0000804c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804C 18056 bytes
SHA-256: 82bd5e5fc9f9c8e10db102fb3f3c15aafc022ab197dd07e70821ea88e25dcd6f

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