Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c9e137560a3282…

MALICIOUS

PDF

49.8 KB Created: 2021-05-14 20:31:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c790fb4160a005edc962cb38aa814297 SHA-1: f7e79e9b28d9252a9d60f88a4d63b0290c2e6079 SHA-256: 33c9e137560a32820de433431f8e2d4cde55e16f1479a11ad083970e7a315dcb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, indicating a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.xyz/app/406889139/coin-master-daily-free-spins-link-facebook-game-hack In PDF document text
    • https://admin.9credit.vn/data/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://admin.9credit.vn/data/files/coin-master-hack-apk-download_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
stream_003_off00004c88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C88 29740 bytes
SHA-256: 81d19899acc89de3f596c74af297ca4ff8c78e4463c0e3f2f245997f04e1c2d3
font_01_sfnt_off00008d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D56 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00009f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6F 18636 bytes
SHA-256: 50d107b0548bd3d005e8b5e4f9cf847a43b3082c8a2089b5591d39299d79db66

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