Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a88bba0109631b…

MALICIOUS

PDF

39.6 KB Created: 2021-04-25 08:50:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a603563c3159564fe7eebaf2c49c25ba SHA-1: 32c6c802106d4c636e9f5384bd92e12ed6390edc SHA-256: 69a88bba0109631b585277829658a80f3b15c8a62e9855836cb0ed454152e5f4
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for Roblox. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-online-free-no-sign-in-game-hack. The document body and embedded links suggest a social engineering lure to drive traffic to potentially malicious websites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/roblox-online-free-no-sign-in-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-robux-iphone-5.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-robux-onroblox-and-pastebin.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-meep-city-money-hack.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-create-a-shirt-on-roblox-for-free.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/robux-hack-no-verification-at-all.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/cool-free-halloween-costumes-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/dinosaur-roblox-hacked.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/free-robux-com-au.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-hack-unlimited-jump.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/get-free-robux-without-playing-games.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_off0000408b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x408B 25184 bytes
SHA-256: 31c950836ce782ec5309a3b553fd18331b1dc69b7528083ba5bd360eee455202
font_01_sfnt_off000078e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E4 18356 bytes
SHA-256: 4bee440a79a9690b3f35b807da6c6ce9d3e006924ea2e5801486345d1abffe8a

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