Malicious PDF — malware analysis report

Static analysis result for SHA-256 38280d8e2d3c8c94…

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 02:22:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 40d81bbcb87dbae168a673dcff04f599 SHA-1: 7449b8b67847179acc6691ef45cedbe1156acbd4 SHA-256: 38280d8e2d3c8c943b9cc0b79f1d50e5d816d4f62fb8b039cac134b15e1503b6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, directing users to pages promising free Robux or game hacks. The ML classifier strongly indicates maliciousness, and the presence of a "download button" heuristic suggests a deceptive user interface. The document's primary function appears to be redirecting users to potentially malicious websites for scams or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/who-to-get-free-robux-game-hack
    • http://bb-im2.com/images/new-free-spins-coin-master_GM406889139.pdf
    • http://bb-im2.com/images/is-roblox-free-on-pc_GM431946152.pdf
    • http://bb-im2.com/images/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://bb-im2.com/images/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://bb-im2.com/images/free-limiteds-roblox_GM431946152.pdf
    • http://bb-im2.com/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdf
    • http://bb-im2.com/images/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://bb-im2.com/images/how-to-get-free-robux-hack_GM431946152.pdf
    • http://bb-im2.com/images/hacks-for-minecraft-windows-10_GM479516143.pdf
    • http://bb-im2.com/images/roblox-www-com_GM431946152.pdf
    • http://bb-im2.com/images/minecraft-reach-hack_GM479516143.pdf
    • http://bb-im2.com/images/robux-hack-2021_GM431946152.pdf
    • http://bb-im2.com/images/free-spin-link-coin-master-today_GM406889139.pdf
    • http://bb-im2.com/images/robux-scam_GM431946152.pdf
    • http://bb-im2.com/images/free-spin-coin-master-game_GM406889139.pdf
    • http://bb-im2.com/images/get-free-spins-from-coin-master_GM406889139.pdf
    • http://bb-im2.com/images/monttechscom-coin-master-free-spins_GM406889139.pdf
    • http://bb-im2.com/images/hacks-for-minecraft-bedrock_GM479516143.pdf
    • http://bb-im2.com/images/free-coin-master-spins_GM406889139.pdf
    • http://bb-im2.com/images/hack-coin-pro-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d1.bin
d56a49bae69338e0f4b741dd64d6a12a6d1057613b299eafc96ca871d6cdeb77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D1 25060 bytes
font_01_sfnt_off000083c3.bin
7ba6f7de64c6d8ae6f5469fb20d9bd46bb355649f5c0a9ce8a2cee34149577d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C3 18484 bytes

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