Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3b3eff0c5b714e…

MALICIOUS

PDF

44.3 KB Created: 2021-05-19 11:50:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a22ad6beacbf5525d19f375ff3b709a SHA-1: 548d2fafddd422d14a3831d775d6e30428ffa80c SHA-256: 7d3b3eff0c5b714eb775bb2e5c8bd9a7bd9ec4c8f9d031a1b61380919227da96
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, identified as a link farm, that point to websites offering free in-game currency and items. The document body and heuristics indicate a lure for free Robux and Coin Master spins, suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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-codes-no-human-verification-game-hack PDF link annotation
    • https://grovehilloutfitters.com/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/coin-spin-link_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/roblox-a_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-robux-now_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://grovehilloutfitters.com/images/free-roblox-groups_GM431946152.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_off00004b37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B37 26700 bytes
SHA-256: 4dfc5849fce1c483523d77c58219c8ceb37d3f9e6b26904d1dfaf2daa9d31c09
font_01_sfnt_off000088ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 19032 bytes
SHA-256: 7535c842b13f5ab09a8d1f6df205e44a1f60a7fdf3d88b4466f5e7b4ed5bfe6e

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