Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bff8bb50623b20…

MALICIOUS

PDF

49.1 KB Created: 2021-05-14 20:30:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a77c39f55c97dfd53e6b688243d20626 SHA-1: 6c249e5a8c02adbb13f3a017feba7b0919d347cc SHA-256: 06bff8bb50623b209dc67cbd2768657ab878008897ffcffb3c77728a6883f1a1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many with SEO-like slugs, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains a URL that likely serves as the initial point of contact for a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/free-robux-that-actually-works-game-hack
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/coin-master-gold-cards-free-link_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/juego-hackeado-de-coin-master_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/hack-spin-coin-master-2021_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-roblox-hair-boy_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-spins-coin-master-unlimited_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-minecraft-windows-10-with-java_GM479516143.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-robux-generator-no-survey_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-unlimited-robux-2021_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-robux-for-kids_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-switch_GM479516143.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/free-robux-glitch_GM431946152.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://elearningma.almatuq.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e86.bin
4102f413b0a46d0a7352a82051a7733ce834637b9ff0bb349498c7f1de887fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E86 28520 bytes
font_01_sfnt_off00008e06.bin
43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E06 3992 bytes
font_02_sfnt_off00009b2d.bin
e9e8736bed1826902485352f20294e96b644ee357cd6186db79dc9b33c578c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2D 19136 bytes

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