Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17bc26f6a4d0266…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 20:24:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ea0332130262fcfa776e236c563be1aa SHA-1: 0ed308449c73b8bcfeab75df1e45e9aecc74b979 SHA-256: a17bc26f6a4d02662f6782da840b5c834a5de719ca9ae98de42e7e61198fb79d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of free in-game items for popular games like Roblox and Coin Master to entice users. It contains multiple embedded URLs, including http://netcdn.tw/app/431946152/free-roblox-clothes-for-your-avatar-game-hack, which likely lead to malicious content or further infection vectors. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and URL findings.

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/free-roblox-clothes-for-your-avatar-game-hack PDF link annotation
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/omega-hack-roblox_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-roblox-gift-card-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/best-free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-roblox-deadpool-suit_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/bomb-hair-salon-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-hack-download-iphone_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-hacks-scythe-script_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-game-com_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-1-million-robux-for-free-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_off0000317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317F 22168 bytes
SHA-256: d3c29286886e23de69b13c00767ffa978f551f04d481b856a6f99542f10ad0f5
font_01_sfnt_off000062ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EC 19336 bytes
SHA-256: 86a71e0106685879ae6faa5057e386fbe27a7aabf9ab932ee5abb54a7eaf4a24

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