Malicious PDF — malware analysis report

Static analysis result for SHA-256 408f37fed1fd150f…

MALICIOUS

PDF

42.8 KB Created: 2021-05-15 02:33:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b62e186689d9a01a2273dfad7458081b SHA-1: 7b01eb914f57d37195cc6ed058e206abce8d949f SHA-256: 408f37fed1fd150f420185d358678ad1ddbf28b81162c847bd13212eb2b7877f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs a fake CAPTCHA lure to trick users into downloading files, as indicated by the 'SE_FAKE_CAPTCHA' heuristic. It also contains a large number of external links, many pointing to PDF files, suggesting a link farm or download redirection scheme. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature, likely serving as a lure for further malicious downloads.

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/406889139/how-do-you-get-free-daily-spins-on-coin-master-game-hack
    • http://ladagoterie.fr/images/minecraft-download-free-download_GM479516143.pdf
    • http://ladagoterie.fr/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://ladagoterie.fr/images/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • http://ladagoterie.fr/images/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdf
    • http://ladagoterie.fr/images/coin-master-hack-apk-download-latest-version_GM406889139.pdf
    • http://ladagoterie.fr/images/download-coin-master-apk-hack_GM406889139.pdf
    • http://ladagoterie.fr/images/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://ladagoterie.fr/images/coin-master-hack-spins-apk-download_GM406889139.pdf
    • http://ladagoterie.fr/images/coin-master-hack-apk-android_GM406889139.pdf
    • http://ladagoterie.fr/images/online-coin-master-free-spin-app_GM406889139.pdf
    • http://ladagoterie.fr/images/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdf
    • http://ladagoterie.fr/images/can-lucky-patcher-hack-coin-master_GM406889139.pdf
    • http://ladagoterie.fr/images/www-coin-master_GM406889139.pdf
    • http://ladagoterie.fr/images/coin-master-free-coins-link-2021-today_GM406889139.pdf
    • http://ladagoterie.fr/images/how-to-change-username-on-roblox-for-free_GM431946152.pdf
    • http://ladagoterie.fr/images/get-free-spins-coin-master_GM406889139.pdf
    • http://ladagoterie.fr/images/coin-master-hack-online-link_GM406889139.pdf
    • http://ladagoterie.fr/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://ladagoterie.fr/images/bloxland-earn-free-robux_GM431946152.pdf
    • http://ladagoterie.fr/images/free-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa3.bin
f3bf83d0ec6ab647497fc74fc65696eb6da11965959d6f44e61454a87de58c9f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA3 25080 bytes
font_01_sfnt_off000083b0.bin
74c8ba82529a8264da82a13379fa888a972f1f638ac6a02f632c6eace9a001bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B0 18772 bytes