Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21b838578ad53d2…

MALICIOUS

PDF

34.8 KB Created: 2021-06-18 15:37:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: db55a13bbf7788fabde5bd6c530bbbf5 SHA-1: 73277213adc96d2615c0d19b7dc7e36d5d57870e SHA-256: d21b838578ad53d291608727716d30deec4f7a74cd4243683c0031265eb37752
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on srmap.edu.in and promote game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/roblox-money-cheat-2021-game-hack, suggests a lure for downloading potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-money-cheat-2021-game-hack
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/coin-master-free-spin-codes_GM406889139.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-instantly-get-free-robux-in-roblox-oprewards_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-hack-on-laptop-july-2021_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/earn-free-robux-by-downloading-apps-and-completing-offers_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-the-marshmallow-head-in-roblox-for-free_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-roblox-and-get-unlimited-robux_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-redeem-codes-for-free_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-roblox-hair-to-wear_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-account-hacked_GM479516143.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-hack-coin-master_GM406889139.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-money-roblox-jailbreak-hack_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/buy-tiktok-followers-free_GM835599320.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-generator-2021_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-tiktok-accounts_GM835599320.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/nerf-fps-roblox-cheat-engine_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-robux-co_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/fairy-tail-online-roblox-hack_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/robux-hack-no-verification_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/robux-for-free-no-robot_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-roblox-accounts-that-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d2.bin
83214e6f77c5712f3f2c1fc201c99dd00218ce9a30d68c6d3bd06caaa9b1911f
pdf-font-stream PDF embedded font (sfnt) at offset 0x30D2 22144 bytes
font_01_sfnt_off000061c9.bin
1e8478dee98e4354c4f449d25cb059d137debcbbe9be8705d3203dc51ad6fb3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 19348 bytes