Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbb7bce411c63b0…

MALICIOUS

PDF

34.4 KB Created: 2021-06-28 20:46:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cdc120ea78f413b487d789562bc0adb3 SHA-1: 2d2e2b960415ff9eeb35b01de336233b62be4bcf SHA-256: 0fbb7bce411c63b035177bb9a4d53f03bfcda128dd5fe495827db4f8b81daacf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are presented as download lures for game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly suggests maliciousness. The primary attack pattern involves directing users to external sites that likely host malware or facilitate further compromise.

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-bleach-primera-hack-game-hack
    • https://www.ruchya.com.tw/upload/files/coin-master-key-free-spin_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-just-freind-me_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/www-free-robux-com_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/robux-generator-no-human-verification-or-survey_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-hack-in-robux-2021_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/tiktok-free-likercom_GM835599320.pdf
    • https://www.ruchya.com.tw/upload/files/bhop-hack-roblox_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/minecraft-bedrock-download_GM479516143.pdf
    • https://www.ruchya.com.tw/upload/files/free-admin-roblox-2021_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/do-this-for-free-robux_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-spins-on-coin-master-cheat_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/free-codes-for-robux-2021_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/robux-sign_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-coins_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/it-is-possible-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002cf6.bin
26514e47ce2205a9a33f92eaef15867c6ef2abe746488cdad5828d7abae86975
pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF6 23192 bytes
font_01_sfnt_off000060bf.bin
ab22e0bc091e0cdcb347a1dc52c919ff98d7c2ff2a42d6ee9f245674a04aeae5
pdf-font-stream PDF embedded font (sfnt) at offset 0x60BF 19356 bytes