Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f357c3e28a1922f…

MALICIOUS

PDF

46.1 KB Created: 2021-05-21 11:31:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b587e9422c527f0391c036937dbe9015 SHA-1: ea4cee5ee9b06aabcffa0b1ac186a4602773aada SHA-256: 9f357c3e28a1922f8918ecdbc2ca9bccdc98ca2d074989d08258cdac61c8948c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a 'free generator' or 'game hack' for popular games. The document body explicitly mentions 'Free Roblox Avatar' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's flagging indicate malicious intent, likely to lead users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7481

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.xyz/app/431946152/free-roblox-avatar-game-hack In PDF document text
    • https://www.markettraderacademy.com/uploaded_files/userfiles/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://www.markettraderacademy.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.markettraderacademy.com/uploaded_files/userfiles/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.markettraderacademy.com/uploaded_files/userfiles/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://www.markettraderacademy.com/uploaded_files/userfiles/files/how-can-you-get-free-robux_GM431946152.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_002_off0000364b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x364B 37804 bytes
SHA-256: 790245356c91ea455c79f0247b8df257082909d5005a1b316262246f55923b12
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 18396 bytes
SHA-256: ea9b66db0b849f47a5cfa8545e574f06832df8c426d4970ca3b5809346365e53

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