Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b5039119a1bacd…

MALICIOUS

PDF

42.1 KB Created: 2021-05-17 13:07:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ece7f8416ea3253d7a799496784678e SHA-1: 7878b7d7fa5c7e42afa5bb091516500c3ed0e0ba SHA-256: 89b5039119a1bacd0fa6673b7809641897a323400e53bb735c41cef0d4280a2c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various websites offering 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious with high confidence. These links likely serve as a lure to redirect users to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-games-game-hack
    • http://www.jsvillas.com.tw/assets/files/robux-now_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/games-to-get-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/how-to-get-robux-easy_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-hacks-and-cheats_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-heaven-daily-free-spins_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-hacked-version-download_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/get-free-spins-coin-master_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/master-free-spin-and-coin-link_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/blogger-coin-master-free-spins_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/wurst-client-download_GM479516143.pdf
    • http://www.jsvillas.com.tw/assets/files/free-spins-coin-master-2021_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-robux-hack-generator_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-hack-2021_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000480f.bin
89492d785e64d37fc23afa20ddf1012ef69a66dbb0c244bcf599427d241a6097
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480F 25808 bytes
font_01_sfnt_off00008197.bin
50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 18500 bytes