Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ae8defa8c7529c…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 16:48:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 70ea9178b79eea6c5d7a81d2d0509a90 SHA-1: ac372c08b7c1d4721729f47c7de0a5cb0ed17185 SHA-256: c4ae8defa8c7529ce973a0593618f6cd7c874ea8d9b39c9b38df8260d48d142b
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be SEO-optimized pages offering downloads for game-related cheats and hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. The primary attack pattern involves luring users to download software from external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/download-skin-roblox-free-game-hack
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-rtx-download-free_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-ios-download_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/minecraft-mod-updater_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-hack-cheat-engine_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/free-robux-no-downloading-apps_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/coin-master-free-link-today_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-card-collection-hack_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/minecraft-hacked-client-18_GM479516143.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/is-roblox-being-hacked-right-now-2021_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-free-play-no-download_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb//repository/instant-robux_GM431946152.pdf
    • http://library.feb.unila.ac.id/rfeb/repository/roblox-piano-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f97.bin
2b13ca1fd31fcdd20d8d6246555925bbe5e456f212db93784ad466443d52b3f4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F97 25192 bytes
font_01_sfnt_off00008830.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8830 3884 bytes
font_02_sfnt_off000094d8.bin
ded359756cb9427a72c1e7734e1a920c35c72ac154f4260fe15531a2d684a1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D8 18972 bytes

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