Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa5d5b3aa80dec0…

MALICIOUS

PDF

31.3 KB Created: 2021-07-19 22:55:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 152568ea8030f1b4cac048d05677cd96 SHA-1: 2cc69f4a36a9d77ca4920a42608984fffaf4bd46 SHA-256: cfa5d5b3aa80dec08e764d6464a148dad35e30e64e63b7328a92c6dd4f660578
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 0.9893

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/coin-master-free-soins-game-hack PDF link annotation
    • http://instrutech.co.th/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://instrutech.co.th/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://instrutech.co.th/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://instrutech.co.th/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://instrutech.co.th/images/free-minecraft-premium-account_GM479516143.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_off00002831.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2831 22504 bytes
SHA-256: 55435748b943a5b0f5500fe824a39a8e89e117ff389ed523703a85a65408e4ca
font_01_sfnt_off00005a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1F 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995

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