Malicious PDF — malware analysis report

Static analysis result for SHA-256 851184bfd4b8d32f…

MALICIOUS

PDF

40.5 KB Created: 2021-05-21 15:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b90926ec10d3d3bde3dfc5f4571f4ad6 SHA-1: 2a888b7e2f2dffbdee203119c1c2518a788d51ac SHA-256: 851184bfd4b8d32fa087d5a12209cbedd055e71272aab393728711d7a69ac15a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a 'Roblox Its Free' hack, including a prominent 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action. It embeds multiple URLs pointing to potentially malicious content, including one directly related to the hack. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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-its-free-game-hack In PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/websites-that-give-you-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_off00003190.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3190 27796 bytes
SHA-256: 4305424d7014f7786fc7b3a8684b0149542ab56504d3ea4e9186243808a3b223
font_01_sfnt_off000071ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 3512 bytes
SHA-256: d2fbe445e4228ea2e3d75d3e8f0f84124f9dd8d3d0cf2c6e4e63bcca92f2519f
font_02_sfnt_off00007d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D83 18052 bytes
SHA-256: 28e620bd92ed75496c639b0b0098322fdf5e49df4814623abb0c2769f623a81c

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