Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c40b87fae7f3ba…

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 22:46:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 341d30ba7a2220010caba5ce056da3ce SHA-1: e1d86d73b92d1210c39227dcdfdcaf32767cb117 SHA-256: 50c40b87fae7f3bab78da454a67f28e9b98eb1357c884e9d0ad3f859cf5f8b82
102 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs and a link farm, strongly suggesting it is designed to redirect users to malicious websites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of download-related lures and the sheer volume of external links indicate an attempt to distribute malware or lead users to phishing sites.

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/479516143/minecraft-free-download-no-virus-game-hack
    • https://emindonesia.com/assets/CKImages/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/free-robux-no-verification_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-hack-ios-download_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-make-free-robux_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://emindonesia.com/assets/CKImages/files/roblox-hacks-2021_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/free-coins-coin-master-daily_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/cute-free-stuff-on-roblox_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/free-robux-com_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-spins-cash_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-game-free-download_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/microsoft-rewards-robux_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/free-coin-master-hacks_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdf
    • https://emindonesia.com/assets/CKImages/files/games-for-robux_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-apk-mod_GM406889139.pdf
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-foxy-food_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d0f.bin
dd051075f00fa57859ba359f46dba17e083e2f29dd88d59bacbd18a6ed71b559
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D0F 26008 bytes
font_01_sfnt_off00008686.bin
73fda2f7f87cf364c845d3fc1df52f7bb102f180f2e093609ba7690804eae928
pdf-font-stream PDF embedded font (sfnt) at offset 0x8686 18564 bytes