Malicious PDF — malware analysis report

Static analysis result for SHA-256 858bd0497b81006e…

MALICIOUS

PDF

33.1 KB Created: 2021-07-24 14:37:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7a29a4c4c9192faf2407727ecef19bf8 SHA-1: 2ed69ba6c0d908d8d73ad0543735c1c02b09ebc7 SHA-256: 858bd0497b81006ee2fae51f2cd84f053d89f118eafcece0ee1ffb868287a99d
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 0.9900

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/835599320/how-to-get-free-coins-on-tiktok-game-hack PDF link annotation
    • https://cdu-lengerich.de/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://cdu-lengerich.de/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://cdu-lengerich.de/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://cdu-lengerich.de/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cdu-lengerich.de/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://cdu-lengerich.de/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cdu-lengerich.de/images/free-robux-master_GM431946152.pdfIn PDF document text
    • https://cdu-lengerich.de/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://cdu-lengerich.de/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://cdu-lengerich.de/images/how-to-get-free-robux-with-no-verification_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_off00002da5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DA5 23084 bytes
SHA-256: 84a17eb5b2d6b6d62536c96d00f0be0b4f2eaaae7c92fab024e9a209dca5ac5f
font_01_sfnt_off00006159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 17620 bytes
SHA-256: a70420454de2d0aac39539e39c590a982a6360a54609316ad93aa98ab536d9bf

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