Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c4282d525dbb61…

MALICIOUS

PDF

43.0 KB Created: 2021-05-10 15:48:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 04566a2f69b9413c01d1d240529f0765 SHA-1: bdc41b6610ca70c02660f1a04b3e5a468f9118e4 SHA-256: 28c4282d525dbb61cd3dad863db2463472278aff3111484f0e1f3df515ca47b5
82 Risk Score

Malware Insights

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

The PDF contains an embedded URL and visual cues suggesting a download lure, consistent with spearphishing attachments. The heuristic for password-protected archives indicates a common technique to bypass security filters. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://netcdn.xyz/app/431946152/cute-free-hair-on-roblox-game-hack
    • http://collectionsuncovered.com/media/storage/editor/files/can-lucky-patcher-hack-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/easy-robux-hack_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-roblox-hack_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-free-hair-codes_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-2021-app_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-old-roblox-accounts_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/how-do-i-get-free-robux_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-hack-1021_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coinmaster-links_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-ios-mods_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/pasos-para-hackear-coins-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-android_GM431946152.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-cards_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/juego-hackeado-de-coin-master_GM406889139.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/download-minecraft-free-hiapphere_GM479516143.pdf
    • http://collectionsuncovered.com/media/storage/editor/files/rbx-website_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004823.bin
a8a4a361553598614b5bf30e1922e3bc84d2c79291a8363fc508500efb0cbd57		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4823 27280 bytes
font_01_sfnt_off0000854c.bin
488c37b81cb6318595a8d643f53454b31d34364b68f61b3c1daecc568804ddf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854C 18540 bytes

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