Malicious PDF — malware analysis report

Static analysis result for SHA-256 935de59a8085c6c9…

MALICIOUS

PDF

32.4 KB Created: 2021-07-19 15:10:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 45a219bafd8bdfbafb0657cf0c983b02 SHA-1: 481081e86626f47bf427dae2188efcb942fbc5f5 SHA-256: 935de59a8085c6c9627cc6db503cb1642a212ee2695d45fa408183a7843601a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as offers for free game currency or hacks. The document body explicitly mentions 'Buy Robux Free' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. The primary malicious URL identified is http://netcdn.tw/app/431946152/buy-robux-free-game-hack, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/buy-robux-free-game-hack In PDF document text
    • http://hindicenter.com/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://hindicenter.com/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://hindicenter.com/images/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://hindicenter.com/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://hindicenter.com/images/free-college-textbooks-tiktok_GM835599320.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_off00002a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A87 22240 bytes
SHA-256: 721d4fc7447e56b681bf616cb977434b6f99376a1d4ae435a2947be7a4382c5b
font_01_sfnt_off00005c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1D 18380 bytes
SHA-256: 476ede5eec74bc10ebccc5dfdd7d4cd59b191e9c851b862356eaa276b62fdd8b