Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227af163cd583b3…

MALICIOUS

PDF

33.9 KB Created: 2021-06-20 06:51:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 893a0a2ab22eb6c8e44f54992593f52a SHA-1: 57cc23bb4344f0f67b4313a7b56b24a442d7b8fa SHA-256: 2227af163cd583b33fa82f60dbaff0d54b238079dc51c21b471126e1ad4f701a
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files, suggesting a link farm or content-scraping operation. The document body and extracted URLs promote 'free Robux' and game hacks, indicating a lure for users to download potentially malicious content. 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 http://netcdn.co/app/431946152/free-robux-everytime-of-use-game-hack PDF link annotation
    • http://slim.sisminkada.net/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/descargar-hack-de-robux-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-real-hack-robux-real-encrypted-pc_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/tiktok-free-10k-followers_GM835599320.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-pls-i-need-some_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-gift-card-codes-2021-september_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/cheat-engine-bypass-roblox-2021_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_off00002cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CF1 22148 bytes
SHA-256: 529608d90bf5a8778793b6f4bf418e7d409391c273328d825c9a78b02556116a
font_01_sfnt_off00005e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E21 19492 bytes
SHA-256: 224bd3dc6d81ce22a0d28f50257020fda4778a3f1804792ff6a9d6ee480b2451

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