Malicious PDF — malware analysis report

Static analysis result for SHA-256 605cac9dd05adb2c…

MALICIOUS

PDF

43.3 KB Created: 2021-05-15 12:07:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d9892b850fc23dda58175a0c19a31bc5 SHA-1: be2eeefd985447ea3044d45d025d1d0379f09ebc SHA-256: 605cac9dd05adb2c13ffa2d5d3750226fef4db3689ceafa492f2e9c6dbe702ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm heuristic, suggesting it is designed to redirect users to external sites. The document body and extracted URLs indicate a lure for 'free Robux' and game-related cheats, a common tactic for distributing malware. The ML classifier also flagged this PDF as malicious with high confidence.

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/431946152/free-robux-co-game-hack
    • http://killebergsridsport.se/images/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://killebergsridsport.se/images/free-spin-and-coin-blogspot_GM406889139.pdf
    • http://killebergsridsport.se/images/roblox-verification_GM431946152.pdf
    • http://killebergsridsport.se/images/apps-to-hack-coin-master_GM406889139.pdf
    • http://killebergsridsport.se/images/get-free-robux-no-human-verification_GM431946152.pdf
    • http://killebergsridsport.se/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://killebergsridsport.se/images/free-robux-website_GM431946152.pdf
    • http://killebergsridsport.se/images/free-robux-no-human-verification_GM431946152.pdf
    • http://killebergsridsport.se/images/free-robux-no-generator_GM431946152.pdf
    • http://killebergsridsport.se/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://killebergsridsport.se/images/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://killebergsridsport.se/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://killebergsridsport.se/images/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • http://killebergsridsport.se/images/roblox-help-free-robux_GM431946152.pdf
    • http://killebergsridsport.se/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://killebergsridsport.se/images/coin-master-free-pet-food_GM406889139.pdf
    • http://killebergsridsport.se/images/www-robux-us_GM431946152.pdf
    • http://killebergsridsport.se/images/robux-free-co_GM431946152.pdf
    • http://killebergsridsport.se/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdf
    • http://killebergsridsport.se/images/daily-coin-master-free-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004997.bin
a4a6302d1aa8a3caebb274694568a428af49ecc3609bb41aa8a52c159b99f53c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4997 27120 bytes
font_01_sfnt_off000087cf.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360
pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 18012 bytes