Malicious PDF — malware analysis report

Static analysis result for SHA-256 3085395a4f95b47c…

MALICIOUS

PDF

37.0 KB Created: 2021-05-23 10:51:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 21d808a1871a33acc7848454de8cf8ae SHA-1: 9b4f3f8d82f3127064e38464c2cf9bef378cd7f8 SHA-256: 3085395a4f95b47c8201cc6258b412f5e504d886c91799df8815fa5cf8eb3299
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 0.9447

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/coin-master-free-daily-spins-and-coins-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/pubg-uc-lebanon_GM1330123889.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_off0000347d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347D 25368 bytes
SHA-256: fcce8ed880257af5239b9695e0650f385c596ad4a9cefd3eb3afbaecc43bc764
font_01_sfnt_off00006ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 18480 bytes
SHA-256: 88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b

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