Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f430f271fdc4a8…

MALICIOUS

PDF

46.3 KB Created: 2021-05-15 10:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 306a68a2e3c7c09785a88b71482acf21 SHA-1: 5b8cb30eab2f174b3680ce2c1c3b4ad786cf2930 SHA-256: b1f430f271fdc4a8bca5d7efe955fec1f93a552fc2e68ab51d4f74ec7dc03752
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are presented as 'SEO link farm' content, suggesting a tactic to drive traffic to potentially malicious sites. The document body and embedded links point towards lures for game hacks and rewards, indicating a social engineering approach. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it acts as a gateway to external content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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-appsfor-coin-master-daily-rewards-game-hack
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-robux-mobile_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-hack-1021_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-coin-hack_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-game-pack-coin-master_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-gold-cards-hack-english_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-that-really_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-2021_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/roblox-robux-hack-generator_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/download-minecraft-java-edition-free_GM479516143.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/get-coin-master-cards-free_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.html
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c9e.bin
97b36e2eea5c5a105d74aed5306164674735f621b3466998b23e2b23e1b05abc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9E 25600 bytes
font_01_sfnt_off00008797.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8797 2840 bytes
font_02_sfnt_off00009149.bin
71ac04cffa71c9bf594e3caaf5f74bb84b218965b92dd7062f0876fd9732766f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9149 18648 bytes

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