Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aed126a09584aed…

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 22:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0a55702a299f303c744065da0fd4dc1 SHA-1: b96762586425afd475c85d9a57273f47488b1799 SHA-256: 0aed126a09584aed3c90d45959003a7e80abeae4cb13252246dae1067558762c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a "free generator" or "game hack". The primary link, http://netcdn.tw/app/406889139/free-spins-and-coins-for-coin-master-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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/free-spins-and-coins-for-coin-master-game-hack In PDF document text
    • https://gryps.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/free-robux-app_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://gryps.de/images/roblox-speed-hack_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_off00002f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9E 22948 bytes
SHA-256: a47154da78e4f3354139d5fa9f9feb6d2aa9f6bce8ea88905fc57d457dd90a1b
font_01_sfnt_off0000630e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 18060 bytes
SHA-256: d4954d2d00bde9f6a1061857a61d2c62c1ae360f44744af150ee923481526d51