Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d8b8883c2a23ab…

MALICIOUS

PDF

32.4 KB Created: 2021-06-19 01:16:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2e664b41f710730dfcc9f833efe5530b SHA-1: 06bcf25f1f11eab008ce6d7f19d6984e98e904d5 SHA-256: 48d8b8883c2a23ab70c497d6d6fb414eba45b234c2fd91431b5d8a3a28824eb1
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on nara.org.uk and appear to be part of a link farm designed to attract users searching for game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/robux-points-get-free-robux-game-hack, is directly associated with the lure of free Robux. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.co/app/431946152/robux-points-get-free-robux-game-hack
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spin-redeem-code_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-coin-master-game-2021_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/free-roblox-games-scripts_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/roblox-troll-outfits-free_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/free-coin-master-spins-link-facebook_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/minecraft-on-computer-free_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/stock-speed-coin-master-free-spins_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/websites-to-get-free-robux_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/coin-master-apk-hack-2021-ios_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/minecraft-free-download-android-apk_GM479516143.pdf
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-spin-160-pro_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/free-spin-coin-master-2021_GM406889139.pdf
    • https://www.nara.org.uk/uploads/files/files/free-robux-site_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-to-scam-on-roblox_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://www.nara.org.uk/uploads/files/files/promo-codes-for-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002af3.bin
a5f476c5ae5f568fce944eb15a80594c0accf636037620222e07053da43ce8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF3 21300 bytes
font_01_sfnt_off00005985.bin
277664eb718aa4d884b38dc1badda4c5b4dd76d026104c149763b81a3fee9eeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5985 19092 bytes