Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23bb4bb89bb40c1…

MALICIOUS

PDF

44.0 KB Created: 2021-05-16 21:36:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 289ea7b2ae2358a53e9a1744cb925a69 SHA-1: d077eb839dfe1a3cb92abb8477be7509363a8a9a SHA-256: d23bb4bb89bb40c1d9f2802a2a248497f868ac03a08f8a881c4bd4aec35073d4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which are part of a link farm designed to appear as legitimate content. The document body and extracted URLs suggest a lure for free Robux or game hacks, indicating a phishing or scam attempt. The presence of external URIs and a link farm points towards an effort to redirect users to potentially malicious sites.

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-to-get-free-robux-instantly-game-hack
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/rare-free-links-to-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/best-free-hacked-client_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-free-play-no-download_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-spin-link-in-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-rape_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/robux-com-free-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-coin-master-spins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-generator_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/com-roblox_GM431946152.pdf
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/getrobux-now_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e8c.bin
061970a1ba4e52a12f76ea15baac15d5ff56aea028396afd42d76eb9d2c208cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8C 25292 bytes
font_01_sfnt_off0000884d.bin
19eb0a1aeef998e7db468722215b94b9b4bc3d0fba007f3cca2c49ee7cc94cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884D 18764 bytes

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