Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9625238ac09973…

MALICIOUS

PDF

38.3 KB Created: 2021-07-22 21:05:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: aa41272ddef8a78eb2fd36b4478dc13c SHA-1: 0e33a02c107f4402a0cd7c7215ce55e28233a601 SHA-256: 0b9625238ac099735d66db7281049a2debe09a96a2deb9e4814aa39302cf5abe
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text that lure the user into clicking a URL, ostensibly to access game hacks. The primary URL, http://netcdn.tw/app/479516143/minecraft-building-hacks-game-hack, is a known redirector for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9550

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • https://maslabaou.com/images/coin-master-free_GM406889139.pdfIn PDF document text
    • https://maslabaou.com/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://maslabaou.com/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://maslabaou.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://maslabaou.com/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://maslabaou.com/images/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://maslabaou.com/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://maslabaou.com/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://maslabaou.com/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://maslabaou.com/images/coin-master-spin-free_GM406889139.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
font_00_sfnt_off00002ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD0 27856 bytes
SHA-256: f91d5267ad06c713203a0c497f268f8c561513a5335baf292c916180d9bfd173
font_01_sfnt_off00006881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6881 2984 bytes
SHA-256: 94583052be7b82affe86843c2d220edd9fe9e81e815911cb5868cf053f59a733
font_02_sfnt_off000072b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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