Malicious PDF — malware analysis report

Static analysis result for SHA-256 670286ceb46b3d4e…

MALICIOUS

PDF

45.8 KB Created: 2021-06-10 21:20:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d06b39b4ac30cdffba66f7d0249f3dd1 SHA-1: 500534845d320b26ae403cc84c5966de72256304 SHA-256: 670286ceb46b3d4ef64d5b2e12c0ff52ebab7b67624a5c2be1329e80ceab1f46
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 0.9864

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.tw/app/431946152/www-free-robux-generator-com-game-hack PDF link annotation
    • http://unifieo.br/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-free-robux-game_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://unifieo.br/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://unifieo.br/images/free-working-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/framed-roblox-hack_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_004_off000051ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FF 26076 bytes
SHA-256: 49d3d5ca951c6d55626eff6e083018e59ec48ff85c31076b7f64dde0a73ec7bf
font_01_sfnt_off00008e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E78 18968 bytes
SHA-256: 53a6024518b0228c0d82451d044da98e1cc53576504200cf74c5a1501e604a63

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