Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6476d9360f8647…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 22:06:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30453feea71585f3ecb8f9b9831891d0 SHA-1: 5b9fbe96fd1e4573dbc1745f173aa19f0f5d973c SHA-256: 6c6476d9360f8647af84d8ed24957eb5d4b77c60eb1b50f5533aadf36e3fcd4d
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links, specifically promoting game hacks and generators. The embedded URL https://netcdn.xyz/app/406889139/coin-master-game-hack-version-download-game-hack is identified as a known malicious redirector. While no scripts were extracted, the document's structure and heuristics strongly suggest it's designed to lead users to further malicious content or downloads.

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-game-hack-version-download-game-hack In PDF document text
    • http://www.rezbb.sk/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://www.rezbb.sk/images/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/moon-active_GM406889139.pdfIn PDF document text
    • http://www.rezbb.sk/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://www.rezbb.sk/images/how-to-get-free-robux-for-real_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_off0000473a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x473A 24484 bytes
SHA-256: 7b11bc61a42fd664870d8c772ccf5ac8b0f5a5702519f5167ebcda6e2378f088
font_01_sfnt_off00007ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECB 18692 bytes
SHA-256: bf7747fad6589835e27396875397848ee10c05064cdddbf89c0c768158d1b55c

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