Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b108a9833e5ab6e…

MALICIOUS

PDF

43.4 KB Created: 2021-05-18 06:05:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9ebe507bcb28ba4cab186fdb8dbe94e3 SHA-1: 617054a72cb8d775e8fb5f9afb00894c8ee1d8ec SHA-256: 5b108a9833e5ab6ec82e484d45f579efb2914e6349d2491d0b1da63ff14e9d92
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack, is likely intended to lure users with promises of free Robux, a common phishing or scam pretext. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-do-you-get-free-robux-on-roblox-game-hack
    • http://glll.de/images/coin-master-hacks-free-spins_GM406889139.pdf
    • http://glll.de/images/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://glll.de/images/cm-free-spins_GM406889139.pdf
    • http://glll.de/images/how-to-sue-roblox_GM431946152.pdf
    • http://glll.de/images/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://glll.de/images/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://glll.de/images/free-spin-app-for-coin-master_GM406889139.pdf
    • http://glll.de/images/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://glll.de/images/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://glll.de/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://glll.de/images/roblox-jailbreak-hack-download_GM431946152.pdf
    • http://glll.de/images/free-robux-hacks-no-verification_GM431946152.pdf
    • http://glll.de/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://glll.de/images/roblox-premium-free_GM431946152.pdf
    • http://glll.de/images/free-robux-games-that-actually-work_GM431946152.pdf
    • http://glll.de/images/get-free-robux-now_GM431946152.pdf
    • http://glll.de/images/pig-master-coin-master-free-spin_GM406889139.pdf
    • http://glll.de/images/coin-master-spin-hack-no-human-verification_GM406889139.pdf
    • http://glll.de/images/robux-hack-generator_GM431946152.pdf
    • http://glll.de/images/coin-master-hack-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049bf.bin
b78bb2882a6547c4bc3ca501a9c25447111f39ef00961c6ea9315ee8d9e1d3e6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BF 25748 bytes
font_01_sfnt_off000085eb.bin
1a1edbb4620230d43f84097700922ea11c75fa5ad69815b80eb1b16329c7dce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EB 18688 bytes

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