Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf63af22b08de883…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 09:52:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d3f61c00cab8e4667db2f73da27e4d6 SHA-1: c728951875e8ebcd412e15c510995eca9df5839b SHA-256: cf63af22b08de883c9b898ff8125e65eee7bfe024217bc2ca08f76bbf7ea700c
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 0.9980

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/robux-generator-without-verification-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-booga-booga-mojo-fly-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-no-hack-may-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-dragon-ball-super-2-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-gear-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verification-2021_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_off00002de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE0 22012 bytes
SHA-256: d7ecf5cb20c492ed6d1ff7afb9e5a6b5931556fa91cfcfa3bf9fa6d1261d335a
font_01_sfnt_off00005ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 19276 bytes
SHA-256: 128dc781028791df6bef372b82492d53ee10555b1aa15fee5127b4d2acfdd3f4

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