Malicious PDF — malware analysis report

Static analysis result for SHA-256 9416209fa34daca8…

MALICIOUS

PDF

36.4 KB Created: 2021-05-22 11:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f4a5781b03fdc702107ebe5d0d73041 SHA-1: af94092f0ae74ebc8f46b942d2fb9be9978cd4fe SHA-256: 9416209fa34daca8b649a3dc45f5e7873df90708f56d2f7927546a31ccd1614c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-coin-master-spins-link-game-hack PDF link annotation
    • http://maxvanberchem.org/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://maxvanberchem.org/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://maxvanberchem.org/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://maxvanberchem.org/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://maxvanberchem.org/images/free-attacks-coin-master_GM406889139.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_off00003515.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3515 24780 bytes
SHA-256: f3c89122407e1a3778e674ab91187bb978ef113305013778deb969e29da2d27f
font_01_sfnt_off00006de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 18056 bytes
SHA-256: 3a13f115a00b8b7b194300b8b076c3bf70984f89fe406390bc378e2507b22e35

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