Malicious PDF — malware analysis report

Static analysis result for SHA-256 3231ae14f29fc181…

MALICIOUS

PDF

34.4 KB Created: 2021-06-18 04:09:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d91073ecdabafcb05c7f3b7314bf5382 SHA-1: c840620259cd8b20633282b1b3ea1a72c76094c9 SHA-256: 3231ae14f29fc1819a301242f11a4c8a0e29f707865d495765975b76c9d9a4f6
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to drive traffic to potentially malicious sites. The document body and extracted URLs indicate a lure related to free game items like Robux, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/i-give-free-robux-for-get-my-clothes-game-hack
    • https://www.kaojen.com.tw/upload/files/free-pet-snacks-coin-master_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/roblox-points_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/free-minecraft-codes_GM479516143.pdf
    • https://www.kaojen.com.tw/upload/files/safe-hack-for-coin-master-android_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-free-coins-2021_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-spin-link-hack_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/free-robux-codes-2021-on-iphone_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/easypoints-gg-roblox_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spins-link-ios_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-generator_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/free-spins-coin-master-no-survey_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-free-spins-ios_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/hacker-de-robux-para-roblox-2021_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • https://www.kaojen.com.tw/upload/files/free-coin-spin_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/real-roblox-hacks-robux_GM431946152.pdf
    • https://www.kaojen.com.tw/upload/files/free-spins-coin-master-march-2021_GM406889139.pdf
    • https://www.kaojen.com.tw/upload/files/coin-master-connection-lost_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ea9.bin
e0cdb60b78929bd1e078c92f809336042b2265daf0f8760b184febe8cfe123b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA9 22244 bytes
font_01_sfnt_off00006023.bin
c31a52d369622ddd38ee4438ce02d416295101c8aea5cd69f15d9e179b249658
pdf-font-stream PDF embedded font (sfnt) at offset 0x6023 19484 bytes