Malicious PDF — malware analysis report

Static analysis result for SHA-256 687cf7f9c7e4280a…

MALICIOUS

PDF

34.8 KB Created: 2021-06-30 10:28:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 121853c4d1bc1486e2582213b7dc5b23 SHA-1: bd799886ae90863a870208f702f43d01f090ca91 SHA-256: 687cf7f9c7e4280aeff048dbe1501c6fbbd60cd9c2b5004fcb1f53aaa69cf743
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms for game-related hacks and cheats. The presence of a direct download URL and the ML classifier's high confidence score indicate a malicious intent to distribute potentially harmful files. The document's content and structure strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/roblox-cool-and-free-hat-catalogue-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/edit-this-cookie-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-add-only-today_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-400-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-pokemon-adventures-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-stuff-on-roblox-2021_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_off00002f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F96 22832 bytes
SHA-256: 2898a50f584e0cb6a0cde8f7fd9b143a4eb69c8d579826b84255866fe7006d71
font_01_sfnt_off000062f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F2 19068 bytes
SHA-256: 8c8ed0ddfde9a5cca88065d77f4bbd5ac4b2c95bccb935cb8bb23183bdd6d2dd

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