Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f08ee2fe80e728a…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 18:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d75a5e6ee108048271a6538a7895d9a SHA-1: 26cde0fb58ab58ee00dc2d1dafa652264c87f73e SHA-256: 0f08ee2fe80e728add317e925be1c5ee384de439f5790e8b16308534bd12ddaf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm designed to drive traffic. One prominent URL, https://netcdn.xyz/app/431946152/earnrobux-game-hack, likely serves as a lure for downloading malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a phishing or malware distribution scheme.

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/431946152/earnrobux-game-hack
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/hack-coin-master-2021-pc_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/hack-master-coin-pc_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/free-games-like-coin-master_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/collect-free-spin-linms-coin-master_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • http://perpus.ar-rum.ac.id//repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://perpus.ar-rum.ac.id//repository/roblox-comroblox_GM431946152.pdf
    • http://perpus.ar-rum.ac.id//repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://perpus.ar-rum.ac.id//repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-spins-free_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/get-roblox-for-free_GM431946152.pdf
    • http://perpus.ar-rum.ac.id//repository/free-spins-on-coin-master-link_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-soins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000479b.bin
b970df151b280039b7c76e224817692f5088e50c5f3877e93de4222681c04821		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479B 28004 bytes
font_01_sfnt_off00008735.bin
2721194a66b32dfdaea4e26ed0bd84b304de41eeda81871a4ffc347c5a8adb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8735 18076 bytes

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