Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff6bf8650957d5d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-02 07:09:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6d0ef527015e2cb1bde906b97193ff65 SHA-1: 5551207efb8dcd616ffecca93057d25a5f32bb9e SHA-256: 1ff6bf8650957d5d3e48a0d469f47a3307c57e4efccfa241abad09a15fdb1e9c
142 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to 'netcdn.co' and many hosted on 'digilib.stie-yppi.ac.id', all related to game hacks and free virtual currency. This suggests a lure to a malicious website or a phishing attempt. The presence of a 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the document's structure and embedded links strongly suggest it's designed to trick users into navigating to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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/redeem-roblox-gift-card-free-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-roblox-go-through-walls_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-suit-not-deflaut_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/crystal-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-final-stand-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/win-free-robux-new-game-order_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-tiktok-likes-no-verification_GM835599320.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-do-you-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-user-hacking-toon_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/lol-roblox-cant-patch-the-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-admin-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_off00002dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEA 22076 bytes
SHA-256: 772d8cf0772b25e983ae7e2431c71fa72924918ddb227bbf25f11eb71c655061
font_01_sfnt_off00005ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED1 19308 bytes
SHA-256: 1c08b5b338fcf0239ad06911c7280b61933223b15540ecb653c8b7a8d6518a41

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