Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d77bd70afc7ed5…

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 00:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70c522956a983a9ba484cd5f9ec3ca71 SHA-1: ef7eaaf9fb5de24e037a2324654cc433f8c6f298 SHA-256: e2d77bd70afc7ed51ccfb0f90a981544d931251c389e136a13492e7fd1b4acbe
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA prompt to trick them into downloading further content. The embedded URLs, such as https://netcdn.xyz/app/431946152/how-to-buy-robux-for-free-game-hack, are designed to lead users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for malicious purposes, likely leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-buy-robux-for-free-game-hack In PDF document text
    • http://mou16-murmansk.ru/images/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://mou16-murmansk.ru/images/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AD 25852 bytes
SHA-256: 40a855c3e5daf072c3f0e5c8058c72ffbb2111e459c77d9bd7d83832430cf65e
font_01_sfnt_off000083eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EB 3096 bytes
SHA-256: d05729863dc05721ada29044278030255eeda038236568e8246a87d3a8573d6e
font_02_sfnt_off00008e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E96 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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