Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7e7d9e715c9bed…

MALICIOUS

PDF

43.7 KB Created: 2021-04-24 19:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 962fb6ffe7b530857e9e3ec05d1a145e SHA-1: a138967447dfdbe20ef51e64ae9bc255b4f59ff7 SHA-256: 1b7e7d9e715c9bed1896aecf3ba10e7364428321faeb8629f46221e372741f38
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure related to 'Roblox hacks' and 'free Robux', designed to entice users to click the malicious links. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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/how-to-hack-roblox-to-get-to-the-admin-robux-game-hack In PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-girl-clothing-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-galaxy-arcade-resourcen-cheats.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/get-free-robux-on-roblox-with-coputer.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/horizon-in-roblox-money-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/cheat-roblox-shark-bite.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-do-a-roblox-hack.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/robuxmaniac-how-to-get-free-robux.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-gun-exploit-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-faces-on-roblox-2021.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-free-bruteforcer.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000042d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42D5 25636 bytes
SHA-256: 5e53966d8636a0d18737f8da2a78d60ac244621ce239f7ee0299edad0f2afaf4
font_01_sfnt_off00007be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE3 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000085a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 19308 bytes
SHA-256: c24b92bd112388aa2ab61dd6caa6392ad2619d5bf923e8a8739dd315078c0a2b

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