Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc845a167f3eac79…

MALICIOUS

PDF

49.5 KB Created: 2021-05-15 01:05:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7cc804a98202de276f50b98c463e57a3 SHA-1: 1b0876aa7bd0231f5e8c52c4a247b64d0fe2137c SHA-256: dc845a167f3eac79fb60bfbfec506cf9df336cdc2121354c8b414c2f3813a2d1
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 0.9349

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/431946152/free-robux-2021-no-human-verification-game-hack PDF link annotation
    • http://naturschutzgossau-zh.ch/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://naturschutzgossau-zh.ch/images/coin-master-free-spins-apple_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_off0000495f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495F 30744 bytes
SHA-256: 2c1a2b34c8448b4d54c0ef98999a3f24fbc9c11f81dc6f507c3a653bb7eec38f
font_01_sfnt_off00008f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F45 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C57 19260 bytes
SHA-256: a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac

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