Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1eca728a31c022e…

MALICIOUS

PDF

41.9 KB Created: 2021-04-30 04:47:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 15a178fe0a7e37a6c69e23238283d63f SHA-1: 074fe04cc680e5671038a966ca458f0782ea9cd0 SHA-256: a1eca728a31c022eda7db629e0998fc0b54b9e01d6b3da404c05e3f08289e5b3
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector. The document body and heuristics indicate a lure related to game hacks and free generators, suggesting an attempt to trick users into visiting these sites. The presence of multiple PDF_MALICIOUS_REDIRECTOR_LINK firings strongly supports this malicious intent.

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/btools-hack-roblox-free-game-hack In PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-roblox-1b-roblox-accounts.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/f3x-tools-hack-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/how-to-make-free-admin-game-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-is-asking-me-to-free-space-help.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-robux-obby-limited-time-only-2021.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/bux-blast-earn-free-robux.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/descargar-roblox-hackeado-adopt-me-para-pc.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/claim-gg-earn-free-robux-for-roblox.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/free-tkay-the-race-roblox-id.pdfIn PDF document text
    • https://www.malesse.com/ckfinder/userfiles/files/roblox-catalog-hacks-thumbnail.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_off00004178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4178 28016 bytes
SHA-256: 225341e13dc3975df8275d3e56db62d819ee0459f2fef6c413d1dede7066cd84
font_01_sfnt_off00008158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8158 18452 bytes
SHA-256: 5c98a52ebb997354e66fb625ce54f447b8018d65ae5290b49fb1c89ad7d030b3

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