Malicious PDF — malware analysis report

Static analysis result for SHA-256 898326333c2030f1…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 09:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 23bc98c0db71d4d169ffbd67a368ce75 SHA-1: be05428dc0011af1ad30010e14f5d7447410194e SHA-256: 898326333c2030f1b62b5d5a98492f20a51c9d2746493cbbe3919415e4f267de
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, suggests a lure related to 'free Roblox accounts with Robux'. The primary URL, https://netcdn.xyz/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack, and the numerous links hosted on webstan.be indicate a likely SEO spam or phishing campaign. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack
    • http://webstan.be/images/hacks-for-roblox-jailbreak_GM431946152.pdf
    • http://webstan.be/images/114-hacks_GM479516143.pdf
    • http://webstan.be/images/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://webstan.be/images/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdf
    • http://webstan.be/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://webstan.be/images/coin-master-free-spin-today_GM406889139.pdf
    • http://webstan.be/images/free-minecraft-realm-codes_GM479516143.pdf
    • http://webstan.be/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://webstan.be/images/free-spins-coin-master-daily_GM406889139.pdf
    • http://webstan.be/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://webstan.be/images/free-2021-robux_GM431946152.pdf
    • http://webstan.be/images/moon-active-games_GM406889139.pdf
    • http://webstan.be/images/free-spins-coin-master-no-human-verification_GM406889139.pdf
    • http://webstan.be/images/coin-master-free-spins-cheat_GM406889139.pdf
    • http://webstan.be/images/roblox-free-hair-girl_GM431946152.pdf
    • http://webstan.be/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://webstan.be/images/free-free-robux_GM431946152.pdf
    • http://webstan.be/images/coin-master-hack-tool-v1-9-download_GM406889139.pdf
    • http://webstan.be/images/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://webstan.be/images/avatar-the-last-airbender-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004819.bin
3a1ff5ddd52abb0cb5fcf77d3136100924845cd0b13c87b22d6edde09c22dbe8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4819 26432 bytes
font_01_sfnt_off00008526.bin
efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783
pdf-font-stream PDF embedded font (sfnt) at offset 0x8526 19248 bytes