Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b3965dc504873…

MALICIOUS

PDF

44.1 KB Created: 2021-05-13 02:00:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a21fd7b271d87da7a5ae966ca4e2b1e8 SHA-1: d50877d9ea30221e0c9e5176e148684554467853 SHA-256: 628b3965dc5048733f7f07e50477cd47d50f4f2e1632d14151ee098852203a36
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as SEO-optimized content for games. The document body and heuristics indicate a lure for free game items or cheats, and the ML classifier strongly flags it as malicious. The primary intent appears to be directing users to potentially malicious websites hosted on netcdn.xyz and perpus-untagsby.web.id.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coin-master-daily-free-spins-link-2021-game-hack
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/best-free-spins-link-coin-master_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-games-that-actually-work_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/300-daily-free-spins-coin-master_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-cheat-client_GM479516143.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spin-trick_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-to-play-minecraft-servers_GM479516143.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-shirt-template-free_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-18-9-hacked-client_GM479516143.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-link_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-free-download-android_GM479516143.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-hack-download-apk_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spins-link-download-for-iphone_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/robux-cheat_GM431946152.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-link-spin_GM406889139.pdf
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/is-coin-master-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ee1.bin
4d5f0e093567d150abb75ac7a7abba9bdc320fa2d6060cd7d1ff2c882b767835		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE1 25088 bytes
font_01_sfnt_off0000883c.bin
4ccb81aabfc378a65bbb004da1df6276046c1b1923188410bd025f5007717b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x883C 18880 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.