Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e8fbd70023f65a…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 18:12:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4dc06cc630ea442dd1f18379941ba1f SHA-1: 9ac19b86db426fb5ca518e0554cdf0d8770f80b1 SHA-256: d9e8fbd70023f65a8e802a0e7d4e75866264407bfca701a068ef3e3c1d4c1821
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including one identified as a malicious redirector. The primary lure appears to be related to 'game hacks' and 'free spins', aiming to trick users into clicking the provided links. The presence of multiple links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/406889139/blogger-coin-master-free-spins-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/free-roblox-script-execuiter-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-girl_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_004_off00004ef4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EF4 25984 bytes
SHA-256: f19b7cd8a48dac924ad57296eca351569ad4dcfe460047e979d6836a7b711851
font_01_sfnt_off00008861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8861 18464 bytes
SHA-256: 0911799b9aa5b6ecf8f75e1ae71094da345a4ed5579c86b7800e8f9c3f9f610d

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