Malicious PDF — malware analysis report

Static analysis result for SHA-256 1732bd47b0cf85cf…

MALICIOUS

PDF

48.0 KB Created: 2021-06-11 12:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 522d83b36a12adf5c719d2ffcf3bdb42 SHA-1: fb4f09fd00af034c895b7ba56de79d5d6e4e639d SHA-256: 1732bd47b0cf85cf4042d3b793a02f55455716015b00937ab30e1bf1c717be2c
122 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 link farm, all pointing to external resources that appear to offer game hacks or cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to game hacks and URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.tw/app/431946152/free-roblox-avatar-editor-game-hack PDF link annotation
    • http://110.232.83.89/slimsppks/repository/free-robux-codes-2021_GM431946152.pdfPDF link annotation
    • http://110.232.83.89/slimsppks/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/pubg-uc-and-bc_GM1330123889.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/hack-para-volar-en-roblox_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-robux-discord-group_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-roblox-for-free-pastebin_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/roblox-app-free-download-for-android_GM431946152.pdfIn PDF document text
    • http://110.232.83.89/slimsppks/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D5 25640 bytes
SHA-256: 3e7689b57ceca6870161d47279c0f4fb173718ba14cff13d6ad615fc34493723
font_01_sfnt_off00008e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1B 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off000097bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97BC 18688 bytes
SHA-256: f64b6d28afb7ab534be99229f66cb06a33c0ae2be73b95f5b1fa94f9e1faa07f

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