Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d9f9b0d252c4b5…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 14:50:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3e89eafcf20684584c4c3ddc28732a21 SHA-1: 7755be449bbf7457d43b7c262d6eebd3354b65da SHA-256: e0d9f9b0d252c4b5f8efaca9de0ce27d022632bc8b943ab4e367fcc5130c196c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, identified as a link farm, that redirect to pages promising game hacks and free Robux. The primary lure URL is https://netcdn.online/app/431946152/games-that-give-you-free-robux-game-hack. While no scripts were directly extracted, the PDF structure and heuristic firings suggest a malicious workflow designed to drive traffic to these external sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/games-that-give-you-free-robux-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-clothes-code_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-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
stream_004_off00005221.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5221 25700 bytes
SHA-256: 8b57fea628e4ad3eb01d3ac9be6572f11f137cb2ff456f10a667ddbaf755e23b
font_01_sfnt_off00008e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 19168 bytes
SHA-256: c4d6735542cd49b50f18b2921f89e54fe5d8ee4af3f47c61005942af246faebd

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