Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ecd2b44cede948…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 07:51:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f78a359102db0846c21aa5d2f4df13a4 SHA-1: 2f7bf48dbfb1ea9124d1567c5df9d775c72d4f79 SHA-256: 10ecd2b44cede9486a18043e7e132b225a0844644d88d6164aa09108d2f41105
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 and promises of game hacks. The primary malicious URL identified is https://netcdn.online/app/431946152/roblox-free-robux-hack-game-hack. The document's structure and content strongly suggest it is designed to trick users into downloading further malicious content, likely through a client-side exploit or by initiating a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/roblox-free-robux-hack-game-hack In PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-hack-engine-download_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://abellamoveis.com.br/ckfinder/userfiles/files/coin-master-spins-hack_GM406889139.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
font_00_sfnt_off0000516c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x516C 24336 bytes
SHA-256: e1b79ec067f59c194a5b35e36bca57d663d2cc097d363d44306b9739dd9fe5e6
font_01_sfnt_off00008945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8945 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000095ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95ED 18488 bytes
SHA-256: 44072fbb5c45a7604268a2c6438126b7db3492802a9c8847ecb07522db400813

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