Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf37b9a4c6624f9e…

MALICIOUS

PDF

36.2 KB Created: 2021-05-13 10:32:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 96befcfa0f8d4461999e7f827222d2b5 SHA-1: da496d685d09362882467a959a549dca4eaf7bbc SHA-256: cf37b9a4c6624f9ebd69bf0c97c478fc71f4b3adee2bd050d763b3fac13f2c15
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'Free Robux Generator' that redirects to malicious infrastructure. The embedded URL 'https://netcdn.xyz/app/431946152/free-robux-generator-com-roblox-hack-game-hack' is flagged as a known malicious redirector. The document body also contains similar text and a call-to-action phrase, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-robux-generator-com-roblox-hack-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3219 24428 bytes
SHA-256: 13e608a7256270be875a5775b5b16eb75687ac6cfb0edb7deb6bc7f7bbea0c5e
font_01_sfnt_off00006a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 18852 bytes
SHA-256: 4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045