Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e39cfaacce7bc26…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 17:11:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f93a58cc17fb59f4cd3cccf7d406fb0f SHA-1: c7db7b2bb2807d55d67270d182dd986d92f22307 SHA-256: 3e39cfaacce7bc26ea46db1704e2477921f1cc0bfa5d7d775f182aed68a5c1f3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF slugs, suggesting a link farm designed to drive traffic. The document body, though heavily obfuscated, contains a URL pointing to a site offering 'free clothes for Roblox' and mentions 'no survey or download', a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-clothes-for-roblox-and-no-survey-or-download-game-hack PDF link annotation
    • http://advancedaudiosystems.org/images/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-unlimited-robux-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-g_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-dragon-ball-z-final-stand-hack-level_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://advancedaudiosystems.org/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5236 26640 bytes
SHA-256: 087b08a0fecb879595c91480d10658739beef699f2da51784d8547f219e665a8
font_01_sfnt_off00008ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF9 19388 bytes
SHA-256: b73460718884bb5c920cbf5312c9a2ae732ecc15445730d96497b15778010490

Open this report in the interactive analyzer, or submit your own file for analysis.