Malicious PDF — malware analysis report

Static analysis result for SHA-256 43868361b6ab7e3d…

MALICIOUS

PDF

47.7 KB Created: 2021-05-15 23:11:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 12cb2ff07def22fef44af148cc70a65d SHA-1: 8b060ab15f9b9500b97667919939d067a42fea71 SHA-256: 43868361b6ab7e3d9926383f05dfd2f983e0c829666f730d9e12f39a57401853
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes free Robux, indicating a lure for potentially malicious downloads. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of these links are intended to create a link farm, likely for SEO manipulation or to host further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/roblox-studio-free-robux-game-hack
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/roblox-hack-tool_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/free-robux-please_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/get-free-robux-info_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-today_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-link_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/minecraft-skins-free-girl_GM479516143.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-free-spins-generator_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/roblox-hack-generator_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-paying_GM431946152.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-ios_GM406889139.pdf
    • https://elearning.masultanhadlirin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad2.bin
63e6e3a0a4e12d98ee3183a7f1d0d8e1f9eafb411848f649677d6803664788c8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD2 27976 bytes
font_01_sfnt_off00008aa5.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 3884 bytes
font_02_sfnt_off0000974c.bin
5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x974C 18484 bytes

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