Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef61dfbddbd975da…

MALICIOUS

PDF

31.9 KB Created: 2021-07-20 16:10:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 479947cc8596e51d5c55db01bf1135b5 SHA-1: 57a5da0ffd0fd5fad8732938cf3f816d0de3f9d0 SHA-256: ef61dfbddbd975da20dab01b6504dc2eb52df09feaadbcb14a106eed14e4e017
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links and a call-to-action phrase, 'CLICK HERE TO ACCESS ROBUX GENERATOR', designed to trick users into visiting a malicious redirector. The primary link, http://netcdn.tw/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or lead users to malicious content, likely as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8903

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 http://netcdn.tw/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • https://www.carela-group.com/wp-content/uploads/fsqm-files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.carela-group.com/wp-content/uploads/fsqm-files/free-robux-please_GM431946152.pdfIn 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_002_off0000241a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x241A 23000 bytes
SHA-256: 8ec88b16c5b86076fc425a177ee710f898f4b713b7e41e6194d7a96433c8b3d5
font_01_sfnt_off0000579a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x579A 19476 bytes
SHA-256: c5aca30ee482ab97ef5a663076df94f5e48f22263153ac395a5dfe60051950ba

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