Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cefb6b9175f34f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 06:48:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a6eb562b4a8eb6b00c45f4659217dce1 SHA-1: 80a4ea5e02603a0ea33e0c7a6e6567dd2cb60104 SHA-256: 25cefb6b9175f34f531e12a44493bb22d19401ae7652e07f3089404ebb7770be
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to the URL http://netcdn.tw/app/431946152/free-robux-for-kids-game-hack. This URL is flagged as malicious and likely leads to a scam or further malware. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URI point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/431946152/free-robux-for-kids-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/01-know-this-free-robux-secret_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-warning-message-cheating_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-1-million-robux-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-prison-life-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-robux-robux-robux-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/explaining-video-free-robux-and-diamonds_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-without-human-verification-or-survey_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_off00002c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C71 22288 bytes
SHA-256: 4a328e6e7b7c632fd164ea8f072d74266276130751c9fbd883d59508e03206f1
font_01_sfnt_off00005dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD5 19012 bytes
SHA-256: afbbc6672e5e67d3d08182cb82f0154e2527ac7a9675429207b3e1307e5db0cb

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