Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b177bd1840635cd…

MALICIOUS

PDF

44.4 KB Created: 2021-04-23 23:45:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 87e70e6860c0002385c6184ac3eec066 SHA-1: 7fda68e0b1e6a12423b9c71a08d89976a4e54033 SHA-256: 3b177bd1840635cd705b5de5cb2c4bf1f23d27dcd54deeb2fe8b15a79d3f933f
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 0.9863

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://netsecure.top/app/431946152/how-to-get-free-robux-on-roblox-2021-may-game-hack PDF link annotation
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/como-hackear-roblox-sin-descargar-nada.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/como-ser-un-hacker-en-house-of-keys-roblox.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/did-biggie-get-robux-free.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-teleporter.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/dragon-ball-af-roblox-cheats.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/free-robux-gameguardian.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/roblox-free-radio-in-jailbreak-deutsch.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/download-fly-hack-on-roblox-vampire-hunters.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-roblox-codes.pdfIn PDF document text
    • https://www.dikes.badungkab.go.id/new/public/ckfinder/userfiles/files/how-long-can-you-get-banned-for-hacking-in-roblox.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_off000043e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x43E6 25376 bytes
SHA-256: b7b6c13fa94d41f4293dc8125dc166bca9446533f256a19fa675cc9e82bc9fef
font_01_sfnt_off00007e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E84 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8834 19364 bytes
SHA-256: 51a894acf1d1fbc8eee6bc293f801404526dc69fda22201d69c02d42465484f8

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