Malicious PDF — malware analysis report

Static analysis result for SHA-256 c937bc1b7b4ae3d3…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 00:39:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5bfdead1c80d4de0d034536689db4a95 SHA-1: 83cadab6b592e08fa154a015e535839780108c79 SHA-256: c937bc1b7b4ae3d315630f5ae4c26d0cf6d6027add88af28751cc4d16ceae0e0
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 0.9982

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 http://netcdn.tw/app/431946152/free-robux-games-that-actually-work-game-hack PDF link annotation
    • http://www.hlad.hr/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-g_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-any-hat-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/pokemon-go-free-gift-codes_GM1094591345.pdfIn PDF document text
    • http://www.hlad.hr/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-retail-tycoon-hack-money_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/promo-code-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/robux-gg-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/easy-working-ways-to-earn-robux-for-free_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
font_00_sfnt_off00002df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF6 22540 bytes
SHA-256: e497fadfb1ac686da08907ad6d8ea2d99fd9156aad13c0bc601f01b20e2d0d82
font_01_sfnt_off00006042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 19868 bytes
SHA-256: d6d6c21ebfb94ec66429bf50c50e6ebacf9910fb21d66d19805e4ed0a6b06ac7

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