Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8a2460a0770f71…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 08:30:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cee5a50573ac117a4281480c847ca479 SHA-1: 1092d1b21c300d690230718ef9040a790731560b SHA-256: 9f8a2460a0770f71b9f8fb12efecced8d5533589abd243bbe81724b05ca272b2
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 0.9971

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/download-coin-master-apk-hacked-game-hack PDF link annotation
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coins-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/avatar-the-last-airbender-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_off0000491f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491F 24284 bytes
SHA-256: f2bc14d0b0136542b7712c2dad891daeb593ff65416bdc1a4ebaf059ddd583e3
font_01_sfnt_off0000807d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807D 18472 bytes
SHA-256: 889c97ae1e8c5f6287d7e9e9a77de81d4c7f2c24e7ca8efa3945bbdf42481e01

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