Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20ba7e9bfe8e5e8…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 17:19:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4039c3ded4e1377739e09128eb92667 SHA-1: c9dffa79a99aecee13a411ca1da7e3209c946af6 SHA-256: f20ba7e9bfe8e5e8d25a6e31ce043c6a58d220ac44ab5dd635ac3cd9a350bd27
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO-optimized links pointing to other PDFs, suggesting a link farm designed to drive traffic. The document body and extracted URLs explicitly mention 'free Robux' and 'Coin Master hacks', indicating a lure for potentially malicious downloads or scams. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-get-an-item-for-free-on-roblox-2021-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/obby-gives-you-free-robux-no-password-required-2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/easy-free-robux-todaycom_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/apps-to-get-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-in-unboxing-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-legendary-egg-in-roblox-mineing-simulator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-easy-2021-on-ipad_GM431946152.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_off00002f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2E 22100 bytes
SHA-256: 16e0cc25da36ee302c9ed0205dce273f8262d2da354b0ab48ce0cfa918432746
font_01_sfnt_off00006009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6009 19580 bytes
SHA-256: e7cf14aea8e0fb74710e4f3079aaff7f56daa23c84a5461a86b8fdba768012e8

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