Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a114b5434e5bb6…

MALICIOUS

PDF

40.7 KB Created: 2021-05-02 11:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b4cdf5bebf917123f654f259d7fdae9 SHA-1: 5f8a66fed2d6143b4cf0dc21132fb14cfa712e4e SHA-256: 66a114b5434e5bb6bfa6db67e1c7a777b7ac2b52d0913a3175f66f8bf1eec9c9
168 Risk Score

Malware Insights

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

The PDF document employs a lure related to 'free Roblox accounts' and 'game hacks' to entice users. It contains multiple links, including one pointing to a known malicious redirector infrastructure at `https://netcdn.xyz/app/431946152/free-2021-account-roblox-game-hack`. This redirector likely serves as a gateway to deliver a malicious payload, potentially exploiting a vulnerability or prompting further user interaction. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.xyz/app/431946152/free-2021-account-roblox-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/game-guardian-roblox-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-survivalist-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacks-for-vehicle-simulator-on-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hacks-for-ninja-legends.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/obc-free-roblox-account.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-wild-savannah-on-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-parkour-hack-script-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/boku-no-roblox-script-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-robux-hack-pc-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-how-to-get-free-lvl-7-hack-2021-august.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_003_off000040f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40F1 25912 bytes
SHA-256: e6bdc75e9770e11068c3ed9a4facaf7ededd1ff77229593d4d42f29c47d5aad9
font_01_sfnt_off00007c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C15 18596 bytes
SHA-256: 60f28d07e867a445f7a3944928c0405e30a8e1c8a865dde6be7202e070d424dd

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