Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c30e859e10d7bdb…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 08:22:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fec93476df84de5e5e08984432185517 SHA-1: 51cf3b0eec2121b092838538eca610fe3cd79592 SHA-256: 1c30e859e10d7bdb96938811c7420b9df7c93a039a282b0e30fb181a59a8c708
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which are SEO-optimized and point to pages related to hacking or free in-game currency. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with the document, likely by clicking on the embedded links. The primary URL, 'https://netcdn.online/app/431946152/free-robux-hack-no-human-verification-game-hack', suggests a lure for obtaining free Robux, a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-robux-hack-no-human-verification-game-hack
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/roblox-studio-free-robux_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/free-mojang-account-with-minecraft_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/roblox-svg-free_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/free-games-coin-master_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-on-pc_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-to-get-robux_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/roblox-tix-generator_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/coin-master-spin-blogspot_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/minecraft-free-play-no-download_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c0b.bin
56cb1ef85804fd634385c30fa90e02fe671ccb3b4c8bdac11f59a602c27e757c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C0B 25064 bytes
font_01_sfnt_off00008511.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8511 2844 bytes
font_02_sfnt_off00008ed3.bin
768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 19028 bytes

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