Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbae860535a7fd4…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 07:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc050acb590583c45712929e2c589415 SHA-1: aa47f165fb1af0ef6e2215fcf190dbd87b17fc9e SHA-256: 8fbae860535a7fd4b472d7c2837001db918296df80b1fa12291cfd8e9681868b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a prominent lure related to 'free spins for Coin Master' and 'free Robux', directing users to external URLs. These URLs, such as http://netcdn.tw/app/406889139/how-to-get-free-spins-for-coin-master-game-hack, are likely intended to lead to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.tw/app/406889139/how-to-get-free-spins-for-coin-master-game-hack PDF link annotation
    • https://www.dc-itsolutions.com/userfiles/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-robux-on-macbook-air-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-gang_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-roblox-lua-scripts-book_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spins-2-5-2021_GM406889139.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
font_00_sfnt_off000033f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F8 23160 bytes
SHA-256: b35d8cb5008a57c4b83c729b722401b190cfbf808e2518fbf95c224fe00f6781
font_01_sfnt_off00006837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 18336 bytes
SHA-256: 23f71a9ba4d854b783c042dde3b810d75211435ebb04f16eb6963276a01a3aa2

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