Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fc3466e885e673…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 08:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c15c3f66848f026362a5d18a06fc701b SHA-1: d226244fe77c404dbeed2a0abce1053b4d489ee3 SHA-256: 78fc3466e885e6738b35ca93f8661c6d18bb67d22b2670e3a51c4a95974e585d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are related to game hacks and free currency for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a tactic to distribute malicious content or lead users to phishing sites. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the document's structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/com-roblox-game-hack PDF link annotation
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-roblox-no-sign-in-account-roblox_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/flamingo-free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/1mobile-get-free-robux-tips-2021-now-2021011_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/kid-cheating-on-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/roblox-naruto-final-bond-ninetails-hack_GM431946152.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003017.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3017 22944 bytes
SHA-256: 80e6e1a7d167bac03ead7a1f330db84648de6e5f82504a7b760ef94733144f9f
font_01_sfnt_off00006356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 18748 bytes
SHA-256: 5efbdd91acf04ee4189407ecfbc860d70cb86f9bc4f939de663b44da789917cd

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