Malicious PDF — malware analysis report

Static analysis result for SHA-256 9211b5cdb11febf0…

MALICIOUS

PDF

48.3 KB Created: 2021-06-08 13:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c84acbf9936924cb4788ad964b8b8f79 SHA-1: d08c01448c47c3d709bc72d85e56f2bcbcdfb74e SHA-256: 9211b5cdb11febf038e227a86ed99b4e54ffa9c93f8fbe74400ddb2a7f4acfe3
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering free in-game items or hacks. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action button further supports a deceptive intent. The document likely serves as a lure to drive users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/hiw-to-get-free-robux-on-roblox-2021-bfast-game-hack
    • https://library.iuli.ac.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdf
    • https://library.iuli.ac.id/repository/hacking-apps-for-roblox_GM431946152.pdf
    • https://library.iuli.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdf
    • https://library.iuli.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdf
    • https://library.iuli.ac.id/repository/magitan-hack-keeps-crashing-roblox_GM431946152.pdf
    • https://library.iuli.ac.id/repository/coin-master-free-mighty-lion-card_GM406889139.pdf
    • https://library.iuli.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdf
    • https://library.iuli.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • https://library.iuli.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdf
    • https://library.iuli.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdf
    • https://library.iuli.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • https://library.iuli.ac.id/repository/free-spins-from-coin-master_GM406889139.pdf
    • https://library.iuli.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • https://library.iuli.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdf
    • https://library.iuli.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://library.iuli.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://library.iuli.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdf
    • https://library.iuli.ac.id/repository/coin-master-attack-madness-hack_GM406889139.pdf
    • https://library.iuli.ac.id/repository/blox-pink-robux-free_GM431946152.pdf
    • https://library.iuli.ac.id/repository/roblox-free-robux-glitch_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f4c.bin
cd40132c51a223d83e9a683236e96367559856839d7a4e5bd1ce3b29f8699438		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4C 26792 bytes
font_01_sfnt_off00008ac5.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC5 3884 bytes
font_02_sfnt_off0000976c.bin
4dc1033d8163d72821c01d78b0f578698aa79ac25eeb2dfff41852a4f8989e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976C 19104 bytes

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