Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77f73c408ecee51…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 20:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6d01389c7608ce6e088db56fad643a39 SHA-1: 43cdb123b023b196aca24b8d24646d1324aa336a SHA-256: b77f73c408ecee5186dabc8e5eb0608252a0a3b031d1d183bc93cdf254fe38ae
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-android-game-hack PDF link annotation
    • http://julo-it.net/images/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/roblox-a_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-roblox-com_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_003_off000047c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C4 26524 bytes
SHA-256: a2c0c10f0d21c5f2a870a8cc49b8632667d8e2cc4ae369070a5c565f6158022a
font_01_sfnt_off000085cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CC 18308 bytes
SHA-256: 3d682ae06d788585f0d48ef4471ddbfed33e391fd6a867cb0ce2fb595824b3ec

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