Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cff856ae111aa2…

MALICIOUS

PDF

34.1 KB Created: 2021-06-26 21:45:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f84f16cfd2448b0f49e518735dcd5a91 SHA-1: 333d764bb234979a9a7c78f6f6a7408508b5443f SHA-256: 58cff856ae111aa20b60a5c1a3872ddab9c1186282ec18d7efea7477e29e0b6c
82 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that lures the user with promises of game cheats and free in-game currency. The presence of a 'password-protected archive handoff' heuristic suggests the document is intended to trick the user into downloading an encrypted payload, which is then likely decrypted using provided password instructions. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-cheat-engine-table-08-2021-game-hack PDF link annotation
    • http://library.stikessuakainsan.ac.id/repository/free-robux-form-rblxgg_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/complete-this-obey-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-models_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-for-kids-100-working_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/noclip-hack-roblox-jailbreak-may2021_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/flame-gg-free-robux-https-flame-gg-zeph_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/descargar-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/online-games-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/beyond-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/neruc-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-hack-knives-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D54 22264 bytes
SHA-256: 5640f57e1f3abac7b0681a2fd043f7f7c520a92bebb1f961076df7ee9545e031
font_01_sfnt_off00005e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E97 19488 bytes
SHA-256: e806e6a6588eb6fd3d5cf776d7d33f43151cfe6b8e6578779d52d6187dd11b9d

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