Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45839fd49fcc7e7…

MALICIOUS

PDF

36.3 KB Created: 2021-06-26 07:28:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e6a6f4d602112ce04586a365ba7cfb9c SHA-1: 9d094089f3c8a1a789fb37e355bf6efdc78a3747 SHA-256: b45839fd49fcc7e726706ca0b2580419fec93a19554a02057a266b5b964c01f4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering "hacks" or "free Robux", suggesting a lure for potentially unwanted software or phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm indicates an attempt to drive traffic to malicious or deceptive content. No scripts were extracted, but the document structure and link farm heuristic suggest a malicious intent to trick users into downloading 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 http://netcdn.co/app/431946152/jailbreak-roblox-hack-2021-february-game-hack PDF link annotation
    • http://falconshipping-uae.com/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-get-free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/are-roblox-emotes-free_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://falconshipping-uae.com/userfiles/files/how-to-hack-coin-master-using-es-file_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
font_00_sfnt_off00003326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3326 22980 bytes
SHA-256: f462c23cea323c50d37b4fa74b638716c209cb64e1204aa99a366b12058ed616
font_01_sfnt_off000066d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D8 19828 bytes
SHA-256: 14a793a634207353a25d7a8b87d4e4663e065b2e0aa4e748ee61e88713e7cf67

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