Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9481b9dfc8c8de5…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 09:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e093453de84a9b5798651ddc7cb1c3e SHA-1: ac15c56b1e41beb94331e0e41dedf80169e91783 SHA-256: b9481b9dfc8c8de541658dab241a964374e71d541590817342f491406074232c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links designed to mimic free offers for popular games and in-game items, acting as a lure for users to click. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the 'ML_NYX_PDF_MALICIOUS' model strongly flagged the document. The primary URL, https://netcdn.online/app/479516143/can-i-get-minecraft-windows-10-for-free-game-hack, is likely the intended destination for users seeking these 'free' items, potentially leading to malware download or further phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/479516143/can-i-get-minecraft-windows-10-for-free-game-hack
    • http://www.library.umbjm.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-coin-master-app_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-pokemon-go-accounts-level-30_GM1094591345.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-food-for-pet_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/real-coin-master-hacks_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-army-free-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-no-verify_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-800-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/roblox-survey-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005338.bin
1937d9612dab0ee9c9a0657c9e2636a154bc70f52b8d742c4bbf429c66c61b5c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5338 24688 bytes
font_01_sfnt_off00008b40.bin
e72d8d1e26c87a5aea965968b922732c7406bc33888678dc3a8c04cb95b3c770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 3128 bytes
font_02_sfnt_off00009580.bin
6ac3bcb80c7412b4530c4d4c769bc132649d8002d05e49718f259242a5c40259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9580 18524 bytes

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