Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59d03187aeb25dd…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 01:37:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44543cdc1509e232acbaeeb85ce505e8 SHA-1: f34a7fb37339899e21dd768b866079fcc975f8b2 SHA-256: c59d03187aeb25dda62c6fdcae2a6e37fc434b380e9cbbef5783d10e001137c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' content. The ML classifier strongly flagged this PDF as malicious. The document body and embedded URLs suggest a lure for game-related cheats or currency, which is a common social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-free-cool-t-shirts-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-without-human-verify_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/do-you-get-free-robux-when-you-work-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/monaco-base-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbxnow-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-item-code_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-twisted-murderer-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-you-hack-roblox-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/no-promises-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-hacks-for-roblox-games_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-tool-generator_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_off000034ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BA 21364 bytes
SHA-256: 262b8c0a19c20f132ea8e84e35961dfbc61e960a8934bc4c4928618975009784
font_01_sfnt_off000062c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C6 19040 bytes
SHA-256: ff86fa585ab72db705b96fe28eda590d9dda7d0a63557ee5cfb83fa8df677609

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