Malicious PDF — malware analysis report

Static analysis result for SHA-256 3757c6b232dcffaf…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 22:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a8ac62d0db403e6a481910fc0415bc57 SHA-1: 08e7b519abe217ca4f6a402599bdb851c57520b3 SHA-256: 3757c6b232dcffafdf5a39ce1d9710faadbe4bdf1f7d47fdb8177445fca3fe66
102 Risk Score

Malware Insights

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

The document exhibits characteristics of a phishing lure, specifically targeting users interested in 'Robux' by promising a generator. It contains a critical heuristic firing for requesting recovery secrets or private keys, indicating a high-risk social engineering attempt. The embedded URL points to a suspicious domain likely hosting a malicious payload, which is further supported by the ML classifier flagging the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.online/app/431946152/robux-generator-com-game-hack
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/was-minecraft-ever-free_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/give-free-robux_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/claim-free-robux_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/coinmasterfree_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/earn-free-robux_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/offers-for-robux_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-daily-rewards_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/rbx-hut_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/minecraft-windows-10-mod-menu_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-coins-for-coin-master_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/wurst-mc_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/classic-minecraft-net-hacks_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-exploits_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/easy-roblox-today_GM431946152.pdf
    • https://Buy.HoaxMC.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c1b.bin
b3750b1421c25b10cbeeca746d666ecde0f175cfaf12d36136aa138f3eb48c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1B 25320 bytes
font_01_sfnt_off000086ff.bin
92b276b2fafaf0bc41eaae7a9091f29374834f042272da8153e5a9b5738015fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x86FF 18440 bytes