Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0db58401d56a49…

MALICIOUS

PDF

44.5 KB Created: 2021-05-11 22:38:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1a23e731bd20fe9c77bd192b8201b990 SHA-1: f3e8dfd3a56129ed8223c738cc1870d1a7336e87 SHA-256: 9b0db58401d56a4905209ac8d9e53243c0c2a049e6f986cbb39531b7f7b469f7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF link farms. The document body and extracted URLs suggest a lure for "free Robux" or "free spins," indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-no-generator-game-hack
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/robux-robux_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-links-for-today_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/robux-generator-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/toolbox-for-minecraft-pe_GM479516143.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-coin-master-glitches_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/roblox-rules_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-spin_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-spin-link-coin-master-app_GM406889139.pdf
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b4f.bin
9e5ad136a4d4c192d51c698c5601eff44189c98241117da68b1fd6f6916a693b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B4F 27948 bytes
font_01_sfnt_off00008b8e.bin
d0a2580a9848789708f711aeedd4c44eef26827bf748da476089155bc80243e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8E 18344 bytes

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