Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e90c1a2ed34e09…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 11:14:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3cf953ee7103f2558786f8078cf4236a SHA-1: acbf368346a1da4fc5c94d95d6e55b9cb4832650 SHA-256: d8e90c1a2ed34e0941576069090b2587cfb2f2c83a376c037cc4e43ebddd1043
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free items, presenting a fake CAPTCHA to trick users into interacting with malicious links. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-stuff-on-roblox-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest it is designed to lead users to potentially harmful websites, likely for further exploitation or credential harvesting.

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/431946152/how-to-get-free-stuff-on-roblox-game-hack In PDF document text
    • http://stroyproekzia.ru/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://stroyproekzia.ru/images/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://stroyproekzia.ru/images/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://stroyproekzia.ru/images/free-robux-hack-generator_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_off00004875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4875 27160 bytes
SHA-256: c97462ef8c6ef30cf79b2140c83c9498ccbeb8f8947c5b9ae3594ae25b973403
font_01_sfnt_off0000849f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849F 18356 bytes
SHA-256: ffaf9c1d0f0fa5958176d70382b911ada4f2001fc33e5be3f9589d94896a3fd5

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