Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c21aadc0712a4cb…

MALICIOUS

PDF

42.1 KB Created: 2021-04-27 00:19:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5179e8b8a7139ea0ae0798b15e598eb7 SHA-1: 9a480bdcb392a8ab1676426b19585c1449103f6c SHA-256: 8c21aadc0712a4cb8a1dbed4a87af3281ffcd1a813ba70ce1328c4ac31d1bfd1
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free in-game currency, which are common lures for malicious content. The heuristic firings indicate these links lead to malicious redirectors and are associated with game hack lures. The document body, though partially corrupted, contains references to these lures and embedded URLs, suggesting an attempt to trick users into downloading further malicious payloads or visiting phishing sites.

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/cheat-engine-roblox-bypass-zip-game-hack In PDF document text
    • http://projectunionstreet.com/library/repository/gift-card-hack-roblox.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-email-for-hacked-account.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-hack-robux-code.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-hacks-build-tools.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-free-robux-all-devices.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/auto-jump-for-roblox-hacks.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-ezpoints-gg.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/code-for-free-obc-and-robux.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-plain-white-shirts-on-roblox.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-promo-codes-for-roblox.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_off000042ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42AE 27520 bytes
SHA-256: 434588c840f68eda220dc0a1c8dfafcbe0b5a8a0951f1b8398aba4b53e3f8be2
font_01_sfnt_off0000805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 19140 bytes
SHA-256: 107a886e684b0d063752f4e0efd963d4a06d1ebd43685a9af39b81789abb16db

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