Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c5ccb3103b441b…

MALICIOUS

PDF

47.3 KB Created: 2021-05-18 01:04:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e25481af48b6f6c7636ae026d5f38b9d SHA-1: 59ef4c9ddbee555eece5ac014919cf5ffdb8b933 SHA-256: 88c5ccb3103b441bfb446eaeebe2c5decc6bec043555d97ed5225bf72afa3d70
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 0.8948

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-unlimited-spin-apk-free-download-game-hack PDF link annotation
    • https://www.alu-as.cz/images/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/coins-master_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/install-coin-master_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/claim-roblox_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.alu-as.cz/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.alu-as.cz/images/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • https://www.alu-as.cz/images/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D1 24540 bytes
SHA-256: a96e804b9147e3e01e67dd685afa473ecb1096bb9d6b7434720f4c139608c7f0
font_01_sfnt_off00008215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8215 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off0000942d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x942D 19084 bytes
SHA-256: c2d82cd4a12004e31f0bd3c8b1caf06db58ba118ed59957898480102bbe81bed

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