Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5231d264e0f160b…

MALICIOUS

PDF

43.3 KB Created: 2021-05-14 04:51:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d225d3126d2fe19defe22d6a99e1e13d SHA-1: bb360fc7d387e74784b451d3b94459c3e7dca84c SHA-256: d5231d264e0f160ba9cfb31c42471c471d8afa9ebb4ff51b92da61ca57f8a46d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized and appear to be part of a link farm designed to attract users searching for free in-game currency or cheats. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though partially corrupted, contains URLs related to "Coin Master" and "Roblox" free spins and generators, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-spins-and-coins-daily-links-game-hack
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/robux-codes_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master-link_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-generator_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-spins-hack-2021_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/minecraft-free-education_GM479516143.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-minecraft-java-edition-codes_GM479516143.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-download-latest-version_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-spin-hack-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-ios_GM406889139.pdf
    • https://elearning.mtsn1batam.sch.id/__statics/gudangsoal/files/coin-master-free-snacks-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004adf.bin
ba81285edf16a91398dc3b1d00b13300f81d4fad1cbd3111b36bbfaee6d35bba		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADF 25404 bytes
font_01_sfnt_off000085ed.bin
e3d0f3d2cfc9c6a1690771b503077d618c720b070dec55624c93c27d11531b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85ED 18652 bytes

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