Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bd467bae992860…

MALICIOUS

PDF

41.8 KB Created: 2021-05-02 00:16:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 511ef5e2ed9c5ba9c905b02d32f05c05 SHA-1: 96a86c30cf0128b22e73d94d4c9fee064fc9c53f SHA-256: 37bd467bae992860a396bf27560a8aee0de1ff07d760cafba0fd5ceeab64d32d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting a 'Roblox Robux Hack App'. The document body, though partially corrupted, contains references to this lure and the malicious URL. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/roblox-robux-hack-app-game-hack In PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/shirt-codes-for-roblox-free-shipping.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-no-robot-verification.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-codes-that-haven-39.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/is-roblox-getting-hacked-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-hack-dll-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-on-alcatel-a5.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-in-roblox-no-hacks-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-rich-roblox-passwords.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-rs-on-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-roblox-blue-hats.pdfIn PDF document text
    • https://freerobux.cyouIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003f8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F8F 29064 bytes
SHA-256: 0e9f45e1bff9ec6c9d851c618e55aa1d3b296698a5e5a96d3b2a79d19d6998bb
font_01_sfnt_off00008106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8106 18500 bytes
SHA-256: 7e363bdbdef857ce0c2c2d9c0103327f1cbeea2f52349d41a9153b6b05d1d1d3

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