Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c98ebadfe37f511…

MALICIOUS

PDF

32.2 KB Created: 2021-06-25 15:47:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 45ac4273a76528be13550871c5643176 SHA-1: e5b6ac063b472508fc2138312077686b78dbf397 SHA-256: 6c98ebadfe37f51173496b1bb00dd65e8f83e2fe01f83eaf77da5a1ac6ff4665
102 Risk Score

Malware Insights

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

The PDF document contains numerous links and text lures related to free in-game currency and accounts for popular games like Roblox and Coin Master. The presence of a PDF URI heuristic firing on 'http://netcdn.co/app/431946152/free-account-roblox-login-game-hack' and a large number of external links suggests a phishing or credential harvesting attempt. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-account-roblox-login-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/cpat-hacker-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/sondage-for-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-work-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-mad-city-free-cars_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-card-codes-live_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-boy-hair-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-free-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-a-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-accounts-with-obc-2021-discord_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-codes-for-the-floor-is-lava-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-worlds_GM479516143.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_off000029b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B3 21624 bytes
SHA-256: 277fbef27375c2cc6e51169a3c4bdab565bf9bbed5d9a85390bb079031cd5e90
font_01_sfnt_off0000593c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x593C 19012 bytes
SHA-256: 8351476717421cd41184ebce349e07f1a549ed23bac2481029c264f7a4ec0ac1

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