Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844b90e76dd620b…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 07:05:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fb70829c06d29ab732f6e8f3765b0c0b SHA-1: 14b520f293fa9a79657d58542296a383a45b3078 SHA-256: b844b90e76dd620b2cbe780f8977b1e8004e2cc4bc3a0b70b1e56d0648390385
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack lure, linking to known malicious redirector infrastructure. The embedded URL and the document body both point to a lure for free game currency, specifically 'Free Robux Codes'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector URL suggests the document is designed to lead the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-robux-codes-no-verification-2021-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/to-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-more-spins-on-coin-master-for-free_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_off000052bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52BF 26968 bytes
SHA-256: 875dfd0fe67f40389bede0521603a83d634e88624d0b085d76c108f6aafc98e8
font_01_sfnt_off00008f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F74 19176 bytes
SHA-256: db1e34f64d78c47646929d75ef8e7d82dfccacc985d29653851fea35b3c0bf96

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