Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c4059661c28877…

MALICIOUS

PDF

34.7 KB Created: 2021-06-22 00:43:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 35ee5d68ed9d51c15c254f5f6319222b SHA-1: 120c0e6e16417b6d8731919d9c8d9ccefe207a30 SHA-256: 41c4059661c28877d85ebf36c3693a1e1c462bab229af400e2fad6857d2a1ea4
122 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, that point to websites offering downloads for popular games and applications, such as Roblox and Coin Master. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The presence of these links suggests an attempt to trick users into downloading malicious software disguised as game cheats or free items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-items-from-roblox-game-hack
    • http://rushxpress.de/images/roblox-apk-free-download-pc_GM431946152.pdf
    • http://rushxpress.de/images/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • http://rushxpress.de/images/wwwcoin-master-hack-apk_GM406889139.pdf
    • http://rushxpress.de/images/free-coin-master-gift-link_GM406889139.pdf
    • http://rushxpress.de/images/hack-coin-master-apk-ios_GM406889139.pdf
    • http://rushxpress.de/images/coin-master-free-coins-link_GM406889139.pdf
    • http://rushxpress.de/images/free-robux-android-zephplayz_GM431946152.pdf
    • http://rushxpress.de/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://rushxpress.de/images/free-draw-roblox_GM431946152.pdf
    • http://rushxpress.de/images/how-to-get-free-money-in-jailbreak-roblox_GM431946152.pdf
    • http://rushxpress.de/images/free-robux-site_GM431946152.pdf
    • http://rushxpress.de/images/how-to-change-your-name-on-roblox-for-free-2021_GM431946152.pdf
    • http://rushxpress.de/images/minecraft-free-trial_GM479516143.pdf
    • http://rushxpress.de/images/my-minecraft-account-was-hacked_GM479516143.pdf
    • http://rushxpress.de/images/how-to-play-roblox-online-for-free_GM431946152.pdf
    • http://rushxpress.de/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://rushxpress.de/images/free-roblox-codes-2021_GM431946152.pdf
    • http://rushxpress.de/images/roblox-adopt-me-free-ride-potion_GM431946152.pdf
    • http://rushxpress.de/images/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • http://rushxpress.de/images/robux-game-com_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f48.bin
d65bfa9661cd3fd19f7a1f29421cc9e403077a9c4587efdd3e89aa9fbf73f4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F48 23004 bytes
font_01_sfnt_off000062c4.bin
f32f48ccc984373312cb13c81d0bf54800957c6045cd2b44058fb9a61c705f98
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 19016 bytes