Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aef3de351dc6a5…

MALICIOUS

PDF

34.0 KB Created: 2021-06-21 12:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7e6aa1ca5ea45fe3b6d3cfc1775e24a8 SHA-1: fe0dec45b72aa888109e2932cada2abe91888fd4 SHA-256: 79aef3de351dc6a5a02d84a05950d7fdd1c28b52c2376fd36beca6f1de4120c1
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a "download button" lure, strongly suggesting it is designed to trick users into downloading malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The primary lure appears to be related to free Roblox gift cards and Robux, a common theme in phishing and scam campaigns.

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/roblox-free-gift-card-org-game-hack PDF link annotation
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hack-on-roblox-to-not-die-in-obby_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-roblox-murder-mystery_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/corrupt-free-roblox-torso_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-voodoo-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-rs-500-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spin-sites-for-coin-master_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
font_00_sfnt_off00002f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8E 21808 bytes
SHA-256: a73190ce4474b37be41d5f4dc87dd3fd1eddc5d36ab6dae663635b10abdba2db
font_01_sfnt_off00005fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 19048 bytes
SHA-256: b05790e4874a7e486bbb1969a8669ad318fc2d9bac3da4f374cccea31baddbf6

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