Malicious PDF — malware analysis report

Static analysis result for SHA-256 715a9ac1f0b6cd87…

MALICIOUS

PDF

39.7 KB Created: 2021-05-10 16:30:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 893265fc0a4d85080455c1a0c09a6853 SHA-1: 4841be9016247c97170d56c8c1c98e7c0d941f84 SHA-256: 715a9ac1f0b6cd87e1f46b5fb0019422139b746b93a0a272d05040da78b24ffa
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 0.9968

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/daily-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://chartsmart.com.au/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://chartsmart.com.au/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/i-got-hacked-on-roblox_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_003_off00004124.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4124 24044 bytes
SHA-256: 9649a837bd3ffa95a43ce94c096ff8bec68e3583df6067d7d062cfec3dd21758
font_01_sfnt_off000077f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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