Malicious PDF — malware analysis report

Static analysis result for SHA-256 211d257892c6fb1c…

MALICIOUS

PDF

46.0 KB Created: 2021-05-11 17:30:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 596486e9779dd12d5d5b7da6b74cbf9d SHA-1: 778cd8cc573509a13c0ab4fb7dba4adf49c6d321 SHA-256: 211d257892c6fb1c6ff6929151e45781c491e9d934b928d4cd97bc4f39cfb8e8
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 attract search engine traffic. The document body and extracted URLs suggest a lure for 'free Robux' or game-related cheats, which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/free-robux-card-codes-game-hack
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-robux-no-gift-card_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/robux-apk_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-daily-free-spins-haktuts_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-robux-just-enter-username_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/google-how-do-you-get-robux_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-hacks-no-surveys_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-cheat-free_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/how-to-get-free-outfits-on-roblox_GM431946152.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-free-coin-and-spin-app_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/free-coin-spin-daily-link-coin-master_GM406889139.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • http://ntfdubai.net/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004956.bin
753e9f49c2ca8c0ece319e1b8d2dd0492581470d9bfdf33c0b4c95386b1b61f6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4956 27484 bytes
font_01_sfnt_off00008726.bin
db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8726 2828 bytes
font_02_sfnt_off000090dd.bin
79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DD 18416 bytes

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