Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a333afd67ea85b…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 18:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dc73ea9061a22d521665081436f98523 SHA-1: bcfea53a7cc28be859f8163c01b02f2211faa5b8 SHA-256: c5a333afd67ea85ba6f294eeb258bf25c7571a58d9cdca1850e725c28f22d9d6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'doc body' that explicitly advertises 'Free Robux' and similar game-related scams. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely part of a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing.

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/free-robux-no-verify-or-download-game-hack
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-get-free-spins_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-draw-2-roblox-kick-people_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/robux-hack-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-com-free_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/wwwcoin-master-hack-game-download_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-hack-android-root_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-earn-robux_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/unlimited-robux-hack-2021_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/erased-citizen-roblox-hack-how_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-cheat-in-roblox-speed-simulator-2_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spin-ml_GM406889139.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-draw-roblox-anime_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/how-do-you-get-free-money-in-roblox-jailbreak_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-minecraft-alts_GM479516143.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-free-robux-website_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-make-a-3d-hack-shirt-on-roblox_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/give-free-robux_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/great-roblox-hacks_GM431946152.pdf
    • https://unsla.uns.ac.id:443/pgsd/repository/free-working-2021-roblox-aim-aimbot_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003088.bin
d257cd3970f2c96247b98ca8fb089dcb5c8c1dbd6e2b338b773b4adb96043f96
pdf-font-stream PDF embedded font (sfnt) at offset 0x3088 22760 bytes
font_01_sfnt_off00006383.bin
13d68239aaa49af38beddaf964fd76aaff29e4485ecbcd07c99fa8d81930556a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 19728 bytes