Malicious PDF — malware analysis report

Static analysis result for SHA-256 a685a933f7139909…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 16:14:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e43273113d79e204832e68dd58214361 SHA-1: 947a8484c44261ec9ae3a918c6b419fa41f6853f SHA-256: a685a933f71399091d923fd9e8982c6027a81248f452aaaa77ea1aee1416813f
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 'https://netcdn.online/app/431946152/how-do-you-get-free-roblox-game-hack' is identified as the primary malicious indicator. While no scripts were explicitly extracted, the nature of the lure and the redirector suggest an attempt to deliver a malicious payload, likely via a client-side exploit or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-do-you-get-free-roblox-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-devil_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robux-for-free-2021-no-vertification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-quiz_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_off0000504b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504B 25828 bytes
SHA-256: dcb2318f2c494eb82a8c32b0f417ea93837af196fea7e02068d32e707d120161
font_01_sfnt_off00008b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 18688 bytes
SHA-256: 094a4600e44b5c04215cd8ac870b75cf15a4da61eb1de076039b07fe4aec062b

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