Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae982ac2c9508a4…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 08:01:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 86d7e2f6d7aaed62333a9c58b36cb972 SHA-1: 63cc53cc0e60af6efe6cdcb8e22f710152556082 SHA-256: bae982ac2c9508a4d3bcb324463f541efbe3b562bfa4fcd21015c712e695f215
142 Risk Score

Malware Insights

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

This PDF document contains a fake CAPTCHA lure to trick users into clicking links, likely for a scam or to download further malware. The document includes a large number of external links, many of which are related to game cheats and virtual currency, suggesting a phishing or scamming attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-robux-co-game-hack
    • http://martincoste.com/images/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://martincoste.com/images/free-robux-quiz_GM431946152.pdf
    • http://martincoste.com/images/free-coin-master-spins_GM406889139.pdf
    • http://martincoste.com/images/coin-master-spin-and-coins-free_GM406889139.pdf
    • http://martincoste.com/images/coin-master-real-hack_GM406889139.pdf
    • http://martincoste.com/images/mobihack-roblox-hack_GM431946152.pdf
    • http://martincoste.com/images/free-coin-master-spin-app_GM406889139.pdf
    • http://martincoste.com/images/coin-master-hack-spins-apk-download_GM406889139.pdf
    • http://martincoste.com/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://martincoste.com/images/coin-master-hack-tool-no-human-verification_GM406889139.pdf
    • http://martincoste.com/images/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://martincoste.com/images/free-spins-coin-master-unlimited_GM406889139.pdf
    • http://martincoste.com/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://martincoste.com/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdf
    • http://martincoste.com/images/minecraft-free-download-android_GM479516143.pdf
    • http://martincoste.com/images/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://martincoste.com/images/free-spins-on-coin-master-game_GM406889139.pdf
    • http://martincoste.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • http://martincoste.com/images/will-minecraft-ever-be-free_GM479516143.pdf
    • http://martincoste.com/images/free-coin-master-hack-no-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000487b.bin
3925a5d41f7b24344fa9ed0faf1363876c791665b84df7249bdea7cc8d5c8745
pdf-font-stream PDF embedded font (sfnt) at offset 0x487B 26244 bytes
font_01_sfnt_off0000839c.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360
pdf-font-stream PDF embedded font (sfnt) at offset 0x839C 18012 bytes