Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cdb11501ea83b9…

MALICIOUS

PDF

34.4 KB Created: 2021-07-19 05:17:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d535a01964e8f7013b487a3d0ab6a5ed SHA-1: 1df32072a118e77439752f7ba430cf171c17b3dc SHA-256: 16cdb11501ea83b9f66d77fb3e1fa225c0875e60ae85d7595f00dbea7c022f38
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 0.9955

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 http://netcdn.tw/app/406889139/free-coin-master-spins-link-game-hack PDF link annotation
    • http://innovativefs.co.uk/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://innovativefs.co.uk/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://innovativefs.co.uk/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://innovativefs.co.uk/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://innovativefs.co.uk/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://innovativefs.co.uk/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://innovativefs.co.uk/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://innovativefs.co.uk/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://innovativefs.co.uk/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://innovativefs.co.uk/images/free-robux-exe_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
font_00_sfnt_off000031d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D1 23000 bytes
SHA-256: 1bc7a9282d9293e529f70c6b222b94bf9e9183820b770fee7a31366edf81dca8
font_01_sfnt_off00006567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6567 18056 bytes
SHA-256: 3a13f115a00b8b7b194300b8b076c3bf70984f89fe406390bc378e2507b22e35

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