Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdf0cb86d25735e…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 04:39:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fae4e4661849774f15929771ea0de01c SHA-1: 7a84c92e628cf31813dcbfbdbea9b6e8bbdbc044 SHA-256: acdf0cb86d25735e880d0d6b1093eddf6a1347700040cebb72d1156e1ac0d3c5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/406889139/master-coin-free-spin-daily-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/roblox-free-robux-online_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-download-apk_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-to-use-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-roubx_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-the-roblox-sex-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-robux-group-funds_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/obby-gives-you-free-robux-no-password-required-2021-link_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-games-that-i-can-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-red-valk-for-free-in-roblox_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_off00002f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F67 23180 bytes
SHA-256: 700e8a621ce396c498aeaf8a198e22110b73922e4c9cdad9941d6407b5f395e7
font_01_sfnt_off00006392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 18596 bytes
SHA-256: 115892fac058e21728dd73f14dd50efb9625691fb0bdc47d6e9343c2bb96a73b

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