Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f42a8955100b5b…

MALICIOUS

PDF

43.8 KB Created: 2021-05-16 19:24:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2fa57d40764ae51eb08f50d2ecfc66e1 SHA-1: 40dc34fb07be428c3b9b3cc1deb9cfe6ed20b41f SHA-256: f8f42a8955100b5ba91bc8ba5abf7d30bc6d1cd7915767c7cd032d019e3a8e63
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external domains. The ML classifier also flagged this PDF as malicious. The primary URL, https://netcdn.xyz/app/431946152/free-robux-easy-and-fast-game-hack, suggests a lure related to 'free Robux', a common theme in scams. While no scripts were explicitly extracted, the presence of many external links indicates a potential for downloading further payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-easy-and-fast-game-hack PDF link annotation
    • http://fotoflas.gr/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/free-pet-treats-coin-master_GM406889139.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
stream_003_off00004a8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8F 27672 bytes
SHA-256: 3d0a91797b1937758a54be041c7a002bdb29f4374b30525b14ad5c7471e7eedb
font_01_sfnt_off000087a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 18700 bytes
SHA-256: cd82fd057618e61f88de5dcbfbdf8dcaa9884b2739de6fa529a9953be94575dd

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