Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3af356a26b48fc…

MALICIOUS

PDF

46.1 KB Created: 2021-05-15 17:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5dfdc2c7d5f80dcf998cafac8041e568 SHA-1: 6e4ef57aa36acc90671daef0cc3183dd7197e5a8 SHA-256: 6f3af356a26b48fca8f82fd8ac5fd2c9b6beae4726c47a89507948688e98aff3
260 Risk Score

Malware Insights

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

The PDF document uses a lure of 'free Robux' and 'game hacks' to entice users to click on embedded links. These links redirect to malicious infrastructure, specifically a site offering a 'free Robux generator' which likely serves as a gateway to further malicious activity. The presence of a fake CAPTCHA and a request for recovery secrets indicates an attempt to trick users into executing commands or divulging sensitive information, aligning with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/get-free-robux-2021-game-hack In PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/more-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/krnl-roblox_GM431946152.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_off00004a64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A64 25916 bytes
SHA-256: e71787ed867d21fff24a3d6298eab8973b7249c14ec83b3fa06718d3af0cc8b1
font_01_sfnt_off000086d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D9 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off000090d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D3 18520 bytes
SHA-256: 6fe0ff66a16b6ee6dc50657e9361d5c62c74e6da0263e26ac7f67f588141101f

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