Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a99bed0c3ddc2d1…

MALICIOUS

PDF

45.5 KB Created: 2021-05-23 20:34:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 14b9fcd879bdf3843f9527057e2f4f49 SHA-1: be343c4f61e23ea1b0894b203f5d4ef6e4f7b779 SHA-256: 9a99bed0c3ddc2d15b4957e9eb5d701ad4bbd64929c8cddc3b2b37ead58e50ef
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action to download a 'Roblox Generator', which is a common lure for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the user might be prompted for a password, indicating a multi-stage infection process. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7481

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/free-robux-giveaway-game-hack
    • http://suryaartajaya.co.id/images/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://suryaartajaya.co.id/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://suryaartajaya.co.id/images/how-to-get-infinite-robux_GM431946152.pdf
    • http://suryaartajaya.co.id/images/free-robux-generator-no-survey_GM431946152.pdf
    • http://suryaartajaya.co.id/images/coin-master-free-spin-link-today-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000037ef.bin
61e5a12d41ba1fa2b2980c3821b6c6d87c79e68e471eb71f937054da2638824c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37EF 27224 bytes
font_01_sfnt_off000076cf.bin
0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CF 7420 bytes
font_02_sfnt_off00008f3e.bin
a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 18820 bytes

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