Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3165b3f3d99dc9…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 11:28:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d4bfd123de664693e20c083f80fabc9f SHA-1: cc4890b3fa1a9aa057eb669a2bcc8499fbbcd158 SHA-256: 1e3165b3f3d99dc98ed2460fdd588462fe79c5f64eec52e56547712699aed2eb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to 'netcdn.xyz' which is associated with game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content strongly suggest a phishing or malware distribution 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-village-cost-game-hack
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/roblox-18_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/coin-master-hack-version-ios_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-android_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/how-to-play-roblox-for-free_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-robux-hack-generator_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-robux-survey_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-robux-please_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/robux-websites-2021_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/youtube-how-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-coin-master-hacks_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-no-survey_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/orewards-com-free-robux_GM431946152.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-spin-links-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn1tasikmalaya.sch.id/__statics/gudangsoal/files/free-coin-master-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cca.bin
573a19068376d5ae5ac4af877772755999e54fd2e7973ba43675a8cb04b809f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CCA 24028 bytes
font_01_sfnt_off00008371.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8371 2880 bytes
font_02_sfnt_off00008d5c.bin
a8028c0297769aa7dba6e0a54b0a1dc6e5838f70d2f821663f5d8e8c2692d7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 18044 bytes

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