Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f40a99ead31cf34…

MALICIOUS

PDF

36.8 KB Created: 2021-05-22 19:09:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: da3656e1fdbc0f60c3021ae1ddb059f6 SHA-1: d3206c74e8c6fc7196633ce02055ecbb7f1cad82 SHA-256: 4f40a99ead31cf340310289030ea89ed4a7be1e9de86ee3d8e716376cd4b1ff1
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' or game hacks. The document body explicitly contains the URL 'https://netcdn.xyz/app/431946152/free-robux-app-game-hack' and other URLs pointing to potentially malicious PDF files. These elements strongly suggest an attempt to trick users into visiting malicious sites, likely for further malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-app-game-hack In PDF document text
    • http://bunadsmaria.com/images/pokemon-go-free-zangoose_GM1094591345.pdfIn PDF document text
    • http://bunadsmaria.com/images/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://bunadsmaria.com/images/tiktok-download-free-jio_GM835599320.pdfIn PDF document text
    • http://bunadsmaria.com/images/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://bunadsmaria.com/images/robux-apk_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_off000032b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32B3 25740 bytes
SHA-256: 05f12b3b09cd5fa5e69d520f4051783e82fcf3e42c70a5b3d40b5f50ec3b1f23
font_01_sfnt_off00006ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBF 18192 bytes
SHA-256: b6ab7ec8c8ad827553cf0587115e299062cd48018093aec7e14a56fabc9ede42

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