Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5a17d7da03e1a3…

MALICIOUS

PDF

49.3 KB Created: 2021-05-17 13:34:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e83cbc6e34a1c9969bb31767b32eb11d SHA-1: 373b835029da0fc8970cd360ae90ab0e72755720 SHA-256: 9a5a17d7da03e1a3af69cbb8b5f20ccacc498b291ee300ce859df20897b90273
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are related to obtaining free Robux, suggesting a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of embedded URLs and the document's structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/is-there-a-way-to-get-free-robux-game-hack
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/minecraft-education-edition-free_GM479516143.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/grabpoints-robux_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/coin-master-hack-ios_GM406889139.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/claim-robux_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/coin-master-level-4_GM406889139.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/minecraft-pe-hack-client-2021_GM479516143.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-2021_GM406889139.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free_GM479516143.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/free-roblox-generator_GM431946152.pdf
    • https://learning.mansatupadangpanjang.sch.id/__statics/gudangsoal/files/coin-master-attack-block-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004db6.bin
c93cda79c6c1c269b8c3f11ce8cee15034d5225809cccc337f144b0539ba66e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB6 37060 bytes
font_01_sfnt_off00009d31.bin
e2ca2daecae93cd27ff1d51a172310d30bada5b25af9f9600d3ad780ee102f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D31 18892 bytes

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