Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f36ed8858e4f808…

MALICIOUS

PDF

49.3 KB Created: 2021-06-08 17:03:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7e4f6689a926ae1ff1c866da13eaeea4 SHA-1: a36f97b031fe1ea491e2d722c59b2f48d5649149 SHA-256: 4f36ed8858e4f808f665122a0ec249a4d9bd3c10f7e33ac79a83e2c53f05b029
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple lures for free in-game currency, directing users to external URLs that likely host malicious payloads. The presence of a 'download button' heuristic and the 'password-protected archive' lure suggest a multi-stage attack where the user is tricked into downloading and potentially decrypting malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-without-buying-stuff-game-hack PDF link annotation
    • http://huananhai.net/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://huananhai.net/images/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005010.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5010 26816 bytes
SHA-256: 9c8afe43c7f549116418229bda62630a006f1fa04d4156f7d2658c42b2058f1b
font_01_sfnt_off00008ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF4 3656 bytes
SHA-256: 63a179d8a9645bea05c6d53b1776faf4e4a7281930de6cf484e639846bec2e20
font_02_sfnt_off00009bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAE 19068 bytes
SHA-256: 736b9e263f5c44d9613a1ebfafe1e3772da3e2604d571cf509c577f7062c389a

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