Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffba28377f10109…

MALICIOUS

PDF

33.6 KB Created: 2021-07-21 05:40:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fadd47c797232febeac0dbb671002de1 SHA-1: 9ada6331ed87ff6537a6309d06cec32861f682b5 SHA-256: bffba28377f101090bf094b76c122756d5beb8d789ea3b40c6a18c80679a9035
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary lure URL, http://netcdn.tw/app/406889139/coin-master-free-daily-spins-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead users to potentially malicious content or further exploits. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/406889139/coin-master-free-daily-spins-game-hack In PDF document text
    • http://hilro.co.za/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://hilro.co.za/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://hilro.co.za/images/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://hilro.co.za/images/free-tiktok-followers-no-verification-or-survey_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
stream_002_off00002c47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C47 23508 bytes
SHA-256: 0f7c06b6e1654a3d214007890b4cddfb654e617d89b2065b7097e72675f4455d
font_01_sfnt_off00006176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6176 18308 bytes
SHA-256: 5c3cefeee4a209382fad51155f4ab19c665f35dca270fe96ae1b58d23c3d8f95