Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafaf81804714e1b…

MALICIOUS

PDF

44.3 KB Created: 2021-05-11 17:49:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 41d4118b92f062ed19b17941ed75388a SHA-1: dc912f3eea903e852b6e446372752c642a6da2ba SHA-256: fafaf81804714e1bb8b154b3426082e3e5c1374298f978d088747dc1b8b520f9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files with SEO-friendly titles, indicating a link farm or content generation scheme. One prominent URL, https://netcdn.xyz/app/431946152/free-robux-gen-game-hack, suggests a lure for free Robux, likely a common phishing or malware distribution tactic. The presence of a 'download button' heuristic further supports the malicious intent of directing users to external resources. No scripts were extracted, but the overall structure and linked content point to a malicious document designed to drive traffic or distribute further payloads.

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 https://netcdn.xyz/app/431946152/free-robux-gen-game-hack
    • http://cintabaca.org/katalog/repository/free-pet-food-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/coin-master-bonus_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/minecraft-redeem-code-free_GM479516143.pdf
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/coin-master-new-link-free-spin_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/how-to-get-robux-easy_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://cintabaca.org/katalog//repository/minecraft-free-download-android_GM479516143.pdf
    • http://cintabaca.org/katalog/repository/minecraft-for-chromebook-free_GM479516143.pdf
    • http://cintabaca.org/katalog/repository/roblox-free-robux-hack_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://cintabaca.org/katalog//repository/free-robux-for-kids-no-verification_GM431946152.pdf
    • http://cintabaca.org/katalog/repository/facebook-coin-master_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • http://cintabaca.org/katalog//repository/is-minecraft-earth-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000487d.bin
abf2bbf3c7000fdacb377d07eb974aa60b11032f19ac4795002435313e0538fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x487D 28008 bytes
font_01_sfnt_off00008bd7.bin
b822dfaf3b200acc051a64c4c7a9b8bc6e1a7e93aa10f3c17b5d396512734dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 18012 bytes

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