Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a28a5b0e9d6076…

MALICIOUS

PDF

33.8 KB Created: 2021-06-26 14:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 662ac5766a0c574ee83823b8a79fb1d8 SHA-1: 47c8b084313985f88da86e35c58d635b9a88812b SHA-256: a8a28a5b0e9d60767b81ecf6d3e728344903083e7837fdced86bdf83b997c867
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes game hacks and cheat codes, specifically for Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier also flagged the document as malicious with high confidence. The primary IOC is the URL http://netcdn.co/app/431946152/robux-cheat-codes-game-hack, which is likely the download location for a secondary payload.

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/robux-cheat-codes-game-hack PDF link annotation
    • https://www.flexcable.com/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/free-roblox-gift-card-uk_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-code-for-call-of-duty-ww2-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/como-hackear-los-robux-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/roblox-brocken-bones-4-ban-cheat_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/online-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-make-a-roblox-hack-using-hxd_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/robux-online_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/roblox-administrator-badge-hack_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-change-a-name-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-hack-csgo-roblox_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/robux-free-generator-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-giveaway_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
font_00_sfnt_off00002d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9B 22252 bytes
SHA-256: 2cbbcf6e37721402b70c80df224e4b8b6665cd9bcbe8aa25cd2b574a045da8b2
font_01_sfnt_off00005f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F34 18996 bytes
SHA-256: 443d080f742f64955ac65cc8bbfaa1752694e136b71bcd23d3b359f4383b9388

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