Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15a40a3c5eadea9…

MALICIOUS

PDF

48.4 KB Created: 2021-05-19 04:09:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0b3f1f5bf2c91e7aac322c88483c0ede SHA-1: 1ae44dbae7e07fb1ed0eb642e9d33ea2036f0a4b SHA-256: e15a40a3c5eadea9e30154fb35155dfce544a0c1a4a04a1dc351ef6437b8b326
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, forming a link farm designed to redirect users to various websites, many of which are SEO-optimized for terms like 'free robux' or 'coin master spins'. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into clicking these links. The primary URLs identified are associated with attempts to distribute game hacks or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/tryrbx-site-free-robux-game-hack
    • http://i-koinoxrista.gr/images/free-coin-master-spins-daily_GM406889139.pdf
    • http://i-koinoxrista.gr/images/free-coins-coin-master-link-today_GM406889139.pdf
    • http://i-koinoxrista.gr/images/roblox-games-to-play-for-free_GM431946152.pdf
    • http://i-koinoxrista.gr/images/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://i-koinoxrista.gr/images/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://i-koinoxrista.gr/images/mcpe-optifine_GM479516143.pdf
    • http://i-koinoxrista.gr/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://i-koinoxrista.gr/images/coin-master-online-hack-link_GM406889139.pdf
    • http://i-koinoxrista.gr/images/coin-master-free-spins-link_GM406889139.pdf
    • http://i-koinoxrista.gr/images/roblox-hacking-website_GM431946152.pdf
    • http://i-koinoxrista.gr/images/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://i-koinoxrista.gr/images/2021-roblox_GM431946152.pdf
    • http://i-koinoxrista.gr/images/free-premium-roblox_GM431946152.pdf
    • http://i-koinoxrista.gr/images/free-robux-no-download_GM431946152.pdf
    • http://i-koinoxrista.gr/images/is-minecraft-java-edition-free_GM479516143.pdf
    • http://i-koinoxrista.gr/images/minecraft-apk-114_GM479516143.pdf
    • http://i-koinoxrista.gr/images/minecraft-hack-client-download_GM479516143.pdf
    • http://i-koinoxrista.gr/images/online-hacking-tricks-coin-master_GM406889139.pdf
    • http://i-koinoxrista.gr/images/robux-hack-2021_GM431946152.pdf
    • http://i-koinoxrista.gr/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004947.bin
cf68f5a415fd3054b91b6e28ed6489ae5bb162b6658256c377fc256dffc4c4e4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 31732 bytes
font_01_sfnt_off000090cc.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x90CC 2824 bytes
font_02_sfnt_off00009a7a.bin
c05555d4ecf6fda64d59e10aa7bbdccb6b0b8342b7e9a04540fdd3a1ca0e8435
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7A 18420 bytes