Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffba0bb0e6fe85b…

MALICIOUS

PDF

39.7 KB Created: 2021-05-23 13:17:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 13c886d0f941d716bc79576eeecf809d SHA-1: 8a8780389776621d209d40cdb4d210f8749966bc SHA-256: 0ffba0bb0e6fe85b1f584c4778b747f6f1bb86cb44abf91243971b7dc5012cf3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free Robux, a common tactic for phishing and malware distribution. The document body and heuristics indicate a clear intent to redirect users to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

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-studio-free-robux-game-hack In PDF document text
    • http://unc-europe.com/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://unc-europe.com/images/coin-master-free-gold-cards-link-2021_GM406889139.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_off00003080.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3080 25672 bytes
SHA-256: 3473f5283e39621557eaebdc15e9e74421e4748c581ee4bb5f668b4c076275ba
font_01_sfnt_off00006bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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