Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9c50b7e06c9d4c…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 11:33:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6dc74ff9bbd52bd9197a8b2605c8c260 SHA-1: a7b63f7d5662e793468b04c53f2caa1949e130c8 SHA-256: 8f9c50b7e06c9d4ca83126b42f244e485c31c4974ade1cd300c1449007e1be04
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to external sites. The document body and extracted URLs suggest a lure related to 'free spins' and 'game hacks', likely a tactic to drive traffic to SEO spam or potentially malicious content. While no scripts were explicitly extracted, the presence of multiple external links and the ML classification strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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/free-spins-for-coin-master-2021-game-hack
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/links-to-free-spins-on-coin-master_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/robux-free-co_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-accounts_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-spins-coin-master-march-2021_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-2021-espaol_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-apk-download_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/cm-spin-link_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/spin-hack-for-coin-master_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/can-you-download-minecraft-for-free_GM479516143.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spin-now_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-coins-coin-master-hack_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-roblox-codes_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/codes-how-to-get-free-robux_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-com-real_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-you-get-free-robux_GM431946152.pdf
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-come_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d12.bin
e97f56b71e763adcfe92be749d012493d36d0e731001302ab79535dbe1a3963d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D12 24732 bytes
font_01_sfnt_off000084a7.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A7 2824 bytes
font_02_sfnt_off00008e4a.bin
66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 18288 bytes

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