Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9d25e055945156…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 02:36:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f87289c058b2c5a3af67dc1dd64eaf4 SHA-1: e1014b55d2f04fe53b37652fb3cbb17f4c6031ba SHA-256: 4b9d25e055945156a11a29bd2d8e476ef6aadb7034c6e3919d3c3e338a8159f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract users with promises of game hacks and free resources. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external links and the SEO-optimized nature of the linked documents indicate a high likelihood of leading users to malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-online-free-game-hack
    • http://emilac.com/images/is-roblox-free-on-pc_GM431946152.pdf
    • http://emilac.com/images/how-to-get-free-minecraft-windows-10_GM479516143.pdf
    • http://emilac.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://emilac.com/images/free-spin-coin-master-today_GM406889139.pdf
    • http://emilac.com/images/free-coins--spins-coin-master_GM406889139.pdf
    • http://emilac.com/images/get-free-cards-coin-master_GM406889139.pdf
    • http://emilac.com/images/roblox-fun-com-free-robux_GM431946152.pdf
    • http://emilac.com/images/coin-master-fan-page_GM406889139.pdf
    • http://emilac.com/images/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://emilac.com/images/free-robux-human-verification_GM431946152.pdf
    • http://emilac.com/images/get-free-spins-coin-master-link_GM406889139.pdf
    • http://emilac.com/images/free-minecraft-skins-pe_GM479516143.pdf
    • http://emilac.com/images/coin-master-link_GM406889139.pdf
    • http://emilac.com/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • http://emilac.com/images/free-spin-online-tool-coin-master_GM406889139.pdf
    • http://emilac.com/images/pro-free-spins-coin-master_GM406889139.pdf
    • http://emilac.com/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://emilac.com/images/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://emilac.com/images/coin-master-free-spins-no-human-verification_GM406889139.pdf
    • http://emilac.com/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a2d.bin
5ba937f127d2dcbe5d8617a3907e4182f104a222e3148ceb72fec04841e54eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2D 25532 bytes
font_01_sfnt_off0000827c.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x827C 2824 bytes
font_02_sfnt_off00008c2b.bin
065eb5bea139eaf43a54c15370d64aa119270a6f111c6de0f976a0e20a38860d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2B 18068 bytes