Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db47bc0f724c4a4…

MALICIOUS

PDF

47.0 KB Created: 2021-05-11 14:11:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa8d6f173ecddc874117af17d4edf59f SHA-1: 1cd0ca0eeb11237d9bf6600fce3b4726d8f75648 SHA-256: 6db47bc0f724c4a43ed9679e36b5cc6821139ecc009295998ca4bbd08df15a9a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or game hacks. The primary lure URL is https://netcdn.xyz/app/431946152/rbx-place-free-robux-game-hack, which is associated with a high-risk score. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/rbx-place-free-robux-game-hack In PDF document text
    • http://ptts.pl/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-robux-generator-no-human-verification-or-survey-2021_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_003_off0000481f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481F 28212 bytes
SHA-256: f8361e3f8d6e871223d541903cba882f6f5856cf915e6dc959e61ca44bab5d1f
font_01_sfnt_off00008a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4C 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off0000949a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x949A 18472 bytes
SHA-256: 30b20ae3df441f067d6970d2fc85ed95190924e4fa28fb295b294374bf1be820

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