Malicious PDF — malware analysis report

Static analysis result for SHA-256 9705a589436e2920…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 01:39:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d87b9f3cd7956b1aeb617be5d1f93af7 SHA-1: 8cfde68405edee442918e2d84c6f794c8a6b8d75 SHA-256: 9705a589436e29202f85eeecfb419afee9fba37c8abf2d6499dfb9ea042cca93
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' lures for popular games like Roblox. The primary redirector URL is http://netcdn.tw/app/431946152/bux-life-free-robux-game-hack, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to lead users to potentially malicious websites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/bux-life-free-robux-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-store-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-girl-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-rs-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/faces-on-roblox-that-cost-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/go-throug-roblox-download-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robuxian-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-rich-in-roblox-accounts-with-limiteds-dump-2021-working_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/easiest-character-to-make-a-roblox-account-for-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/synapse-roblox-hack-free-download_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
font_00_sfnt_off00002fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDF 22600 bytes
SHA-256: 093455d4173f43c255684aabe17666691ea6b40e2f573826b2654f55a6f4c644
font_01_sfnt_off00006235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 18836 bytes
SHA-256: 7f12d751da4e96ccad4d997d7560df235183c1e20666712b69b1e712c003bbe9