Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5519cc922b37083…

MALICIOUS

PDF

45.3 KB Created: 2021-05-21 04:42:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb3de68876d27ca2357f5ea1c0876973 SHA-1: 5fff0df1d1fe8b0dc0332822a8653b903f24fbcb SHA-256: d5519cc922b3708332cdae06bba14cd82a31e2f165ab2c26bac01c1f3fde56f7
102 Risk Score

Malware Insights

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

The document contains a lure for free Robux, a popular virtual currency, and includes a critical heuristic firing for requesting recovery secrets. It also contains multiple embedded URLs pointing to potentially malicious content, including one that appears to be a PDF download. The ML classifier also flagged this PDF as malicious. The presence of embedded links and the nature of the lure suggest an attempt to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7947

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.xyz/app/431946152/how-to-get-free-robux-without-downloading-apps-game-hack
    • http://apostolosandreaslemesou.com/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://apostolosandreaslemesou.com/images/free-daily-spin-coin-master-game_GM406889139.pdf
    • http://apostolosandreaslemesou.com/images/free-generator_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://apostolosandreaslemesou.com/images/free-promo-codes-for-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003464.bin
46e128dfb96dca1606e68d3e06d4893450965f6fa9c6d14ba7e45e7636fd8c0a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3464 26256 bytes
font_01_sfnt_off000070dd.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 3884 bytes
font_02_sfnt_off00007d7f.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7F 5696 bytes
font_03_sfnt_off00008a91.bin
8da7f6a753952615a486eb6a0fdfe7794e2ad045808eb185ac8c0a25e8999c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A91 19876 bytes

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