Malicious PDF — malware analysis report

Static analysis result for SHA-256 f357f5e4607c9c8f…

MALICIOUS

PDF

42.1 KB Created: 2021-05-16 01:38:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f93634b0aa7ccd618195b80cb8305f3e SHA-1: 5fc5ef8de4039f1584800b43357c9441549c0293 SHA-256: f357f5e4607c9c8fb3af7ff6dc5f16204ce920de1b81950b9ed8be35120cca69
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on algierimasonry.com and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to game hacks and APK downloads, suggesting a lure for users seeking cheats. The presence of a large number of external links and the ML classification strongly indicate malicious intent, likely to redirect users to download malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-hack-apk-iphone-game-hack
    • http://algierimasonry.com/images/javascript-free-robux_GM431946152.pdf
    • http://algierimasonry.com/images/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • http://algierimasonry.com/images/roblox-free-robux-generator_GM431946152.pdf
    • http://algierimasonry.com/images/free-robux-without-downloading-anything_GM431946152.pdf
    • http://algierimasonry.com/images/coin-master-free-shield-link_GM406889139.pdf
    • http://algierimasonry.com/images/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://algierimasonry.com/images/www-robux-us_GM431946152.pdf
    • http://algierimasonry.com/images/how-to-get-free-robux-games_GM431946152.pdf
    • http://algierimasonry.com/images/coin-master-free-link-today_GM406889139.pdf
    • http://algierimasonry.com/images/coin-master-daily-spin-free_GM406889139.pdf
    • http://algierimasonry.com/images/coin-master-hacks_GM406889139.pdf
    • http://algierimasonry.com/images/hack-my-spins-coin-master_GM406889139.pdf
    • http://algierimasonry.com/images/haktuts-coin-master-free-spins_GM406889139.pdf
    • http://algierimasonry.com/images/roblox-free-no-download_GM431946152.pdf
    • http://algierimasonry.com/images/free-account-roblox-with-robux_GM431946152.pdf
    • http://algierimasonry.com/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://algierimasonry.com/images/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://algierimasonry.com/images/robux-miner_GM431946152.pdf
    • http://algierimasonry.com/images/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://algierimasonry.com/images/coin-master-free-spins-and-chips_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aaa.bin
46cbe89dd65db40e7a4c705e53587871f044aa5fef3887b5f61fe48dbf6f577e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAA 24552 bytes
font_01_sfnt_off000082d2.bin
639b29b672cbc71240036f13b92c48af60df51001630b17541f0bd34647b9b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D2 18060 bytes