Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8456ac5256de710…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 01:56:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 583cb8bbf8177a01e9b55fde915d464b SHA-1: b52ecf81c9c029878572f56f4f627c2df95a5800 SHA-256: b8456ac5256de710490577b395fdcaaf0cd9a2e318cc00440e2341e42b13688d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering game hacks and free virtual currency, such as 'Free Robux'. The presence of a 'PDF_SEO_LINK_FARM' heuristic and a high ML score indicates a malicious intent to direct users to potentially harmful websites. The document body and extracted URLs strongly suggest a phishing or malware distribution lure.

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.tw/app/431946152/free-robux-no-human-verification-and-no-survey-game-hack
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/assassin-cheats-roblox_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-sites-that-work_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-roblox-accounts-with-bc-and-robux_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/get-free-robux-if-you-finsh-ths-obby_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/free-robux-apk_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-roblox-limited-items_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/hack-para-traspasar-paredes-en-roblox_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/roblox-free-robux-no-human-verification_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-com-2021_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/speed-hack-using-check-cashed-on-roblox_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/can-you-download-minecraft-for-free_GM479516143.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-online-minecraft-server_GM479516143.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/how-to-play-minecraft-online-for-free_GM479516143.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/roblox-no-download-hack_GM431946152.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coins-for-pokemon-go-free_GM1094591345.pdf
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/roblox-free-account-with-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003127.bin
252c61bff71686d3ed0f67fa29e1f534ddc691ae34d646cb85ea50c1eb040197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3127 22128 bytes
font_01_sfnt_off00006232.bin
fcd4d125090859beb8b270f882485097339e29693181c3776c14839bc9dcd643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 19800 bytes

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