Malicious PDF — malware analysis report

Static analysis result for SHA-256 5564397c47e1fd4a…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 00:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6d9e5d85513600e88420754fcd9c1935 SHA-1: 2cac4f09d2079da4fb271a63577f5748b6e0a00c SHA-256: 5564397c47e1fd4af1bab9ac6d2863be4f08b38c581e04b06aa327590102c406
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related cheats and hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of links, which is leveraged here for a link farm or phishing attempt.

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/406889139/coin-master-free-cards-link-game-hack
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-robux-apps-that-work_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/spinuri-gratis-coin-master_GM406889139.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/robux-hack-tools_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free_GM479516143.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/minecraft-java-edition-download-free_GM479516143.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/coin-master-pc-hack-download_GM406889139.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/how-to-get-java-minecraft-free_GM479516143.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/coin-master-hack-xyz-download-free_GM406889139.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-robux-without-survey_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/roblox-hack-site_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-roblox-characters_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-robux-just-enter-username-and-password_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/free-400-spins-coins-master_GM406889139.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/roblox-hack-app_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/coin-master-free-spin-facebook-link_GM406889139.pdf
    • https://elearning.min1banyumas.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049c2.bin
6469472c30b575d880bb97e9c1d179985f91255b5bdae439e00c16a429758345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49C2 24692 bytes
font_01_sfnt_off00008163.bin
4c00fba11e6222d30ce91962ad0846eff86227a46da4e4704094e367f0981575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 18056 bytes
font_02_sfnt_off0000a2b0.bin
e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B0 3264 bytes

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