Malicious PDF — malware analysis report

Static analysis result for SHA-256 8535bb73414f0de7…

MALICIOUS

PDF

46.8 KB Created: 2021-05-15 14:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b99b0603e7dbfc7998ca811fcdda734 SHA-1: 48fa1411e9a4189b83c6452fcf0a1c3aa6407ef9 SHA-256: 8535bb73414f0de72ff529fac2eb9623d4bfec53a7e8d933454d4e0c2b8413e9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO spam campaign. The primary URL, https://netcdn.xyz/app/431946152/claim-free-robux-game-hack, suggests a lure for free Robux, a common tactic in phishing and scam operations. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/claim-free-robux-game-hack
    • http://ernstgloves.co.il/images/roblox-toy-codes-free_GM431946152.pdf
    • http://ernstgloves.co.il/images/coin-master-free-spins-for-today_GM406889139.pdf
    • http://ernstgloves.co.il/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdf
    • http://ernstgloves.co.il/images/free-coins-coin-master-link_GM406889139.pdf
    • http://ernstgloves.co.il/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://ernstgloves.co.il/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdf
    • http://ernstgloves.co.il/images/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • http://ernstgloves.co.il/images/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://ernstgloves.co.il/images/how-to-hack-roblox_GM431946152.pdf
    • http://ernstgloves.co.il/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://ernstgloves.co.il/images/roblox36com-free-robux_GM431946152.pdf
    • http://ernstgloves.co.il/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://ernstgloves.co.il/images/how-to-get-robux-easy_GM431946152.pdf
    • http://ernstgloves.co.il/images/games-like-minecraft-but-free_GM479516143.pdf
    • http://ernstgloves.co.il/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • http://ernstgloves.co.il/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://ernstgloves.co.il/images/roblox-hack-game_GM431946152.pdf
    • http://ernstgloves.co.il/images/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdf
    • http://ernstgloves.co.il/images/coin-master-free-items_GM406889139.pdf
    • http://ernstgloves.co.il/images/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004851.bin
1c302ab3c7f6fad513c5f74435afd0ce3ac533446a25f434c8a43407cd206dbf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4851 28636 bytes
font_01_sfnt_off00008976.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8976 2880 bytes
font_02_sfnt_off00009361.bin
5cf9f9319346d61d0cee7eea738a99b5b91b4687cc89c43f6f5509699f250cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9361 18696 bytes

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