Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a4fc8ed42cfd51…

MALICIOUS

PDF

46.2 KB Created: 2021-05-15 08:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bd39e6725ecf41b2d31b1ee546478c38 SHA-1: f2808ab5972c485143d067a481e4aa1a942b96a5 SHA-256: f5a4fc8ed42cfd518fb6bfa17fefa854a5c269a4e380e8387bd1d5f46ba28d44
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that are part of a link farm, aiming to direct users to scam websites offering free game currency or hacks. The ML classifier also flagged this PDF as malicious. The presence of external URIs and a link farm suggests a phishing or scamming attempt, likely delivered as a spearphishing attachment.

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-roblox-gift-card-codes-game-hack
    • https://www.donjastubica.hr/files/free-robux-no-human-verify_GM431946152.pdf
    • http://www.donjastubica.hr/files/minecraft-java-server-hosting-free_GM479516143.pdf
    • http://www.donjastubica.hr/files/free-spins-coin-master-app_GM406889139.pdf
    • http://www.donjastubica.hr/files/free-roblox-gfx_GM431946152.pdf
    • https://www.donjastubica.hr/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdf
    • http://www.donjastubica.hr/files/how-to-get-free-robux-inspect_GM431946152.pdf
    • https://www.donjastubica.hr/files/roblox-hack-site_GM431946152.pdf
    • http://www.donjastubica.hr/files/coin-master-mod-free-download_GM406889139.pdf
    • http://www.donjastubica.hr/files/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdf
    • https://www.donjastubica.hr/files/www-coinmaster_GM406889139.pdf
    • https://www.donjastubica.hr/files/coin-master-game-hack_GM406889139.pdf
    • https://www.donjastubica.hr/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • https://www.donjastubica.hr/files/coin-master-online-hack-link_GM406889139.pdf
    • http://www.donjastubica.hr/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • https://www.donjastubica.hr/files/free-minecraft-maps-pe_GM479516143.pdf
    • http://www.donjastubica.hr/files/coin-master-hack-app-android-download_GM406889139.pdf
    • http://www.donjastubica.hr/files/free-coin-master-app_GM406889139.pdf
    • https://www.donjastubica.hr/files/coin-master-pc-game-free-download_GM406889139.pdf
    • http://www.donjastubica.hr/files/free-robux-games_GM431946152.pdf
    • http://www.donjastubica.hr/files/minecraft-login-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004851.bin
a78d88bcbec657aeaea799277422c23b7361b0bdd07b812c74cb22d11b997fb0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4851 27060 bytes
font_01_sfnt_off00008600.bin
49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 3120 bytes
font_02_sfnt_off00009113.bin
ffbc77db5113ad0b7fd344ce16d81dafdbf0c64cd7df39142b32362cc1b263a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9113 18572 bytes