Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f9ea6030e5ba23…

MALICIOUS

PDF

35.0 KB Created: 2021-06-22 23:11:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ee47a715e3bd062de59e86c3d2a7e479 SHA-1: d2f24c49cd8095691f94d6d7d6ca56f03478064b SHA-256: c3f9ea6030e5ba23255dd7663e30293f8135e6aef80ddd019ffba0a38ea4f0c8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'link farm' structure, strongly suggesting it is designed to redirect users to external sites. The document body and extracted URLs indicate a lure related to free game currency (Robux, Coin Master spins), a common tactic for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

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/free-robux-gift-card-giveawa-game-hack
    • http://www.myresidence.lu/userfiles/files/roblox-hack-tool-robux-and-tickets-download_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/redeem-roblox-virtual-item-free-codes-2021_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-quora_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/if-sombody-cheats-in-roblox-what-do-you-do_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-without-verification_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/free-400-spins-coin-master_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/roblox-hacked-version-download_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/abstract-hack-roblox_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/guide--coin-master-free-tips_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/free-robux-hacker-us_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/free-coin-master-game_GM406889139.pdf
    • http://www.myresidence.lu/userfiles/files/inject-hack-roblox-2021_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/free-robux-exe_GM431946152.pdf
    • http://www.myresidence.lu/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa3.bin
cb230b8ad246bc6cfaf2a5d119067fa22c2d633be0bbfc2629aa83567e535859
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA3 22656 bytes
font_01_sfnt_off00006298.bin
3b51c547823a0fb43e344308fca016e3205b7f3c3f41c8171333ba6a11c753e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 19392 bytes