Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19d53349d7568be…

MALICIOUS

PDF

51.1 KB Created: 2021-06-03 04:54:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5173c28e8500208c28c8ece555b5b798 SHA-1: 20c397936e6b91c0d5fa33de35fe2528191dc93c SHA-256: c19d53349d7568bea282d3496e59e4d3c091f3d752bf0f14275a026526ad1dbd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically promoting 'game hacks' and 'free generators' to lure victims. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure strongly suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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/431946152/how-to-hack-in-roblox-prison-life-game-hack In PDF document text
    • http://library-fkip.uho.ac.id/repository/which-tiktok-free-movies_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-free-robux-com_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_004_off00005071.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5071 24652 bytes
SHA-256: e3fdd8e31a0ac4a7404fb38feca8d890ced9a9385a4e2db4691dc22a3f6f7e70
font_01_sfnt_off00008938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8938 8132 bytes
SHA-256: 7b13f62dd83f6e5b39d850f66139f44fff841e4e695f86fdfbe4d5a2de470bf2
font_02_sfnt_off0000a429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA429 18620 bytes
SHA-256: 06c4a0a22987171f64eaf6d898502a0ddf1128172b72fd679b67faae34548247

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