Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a825542f543b7f…

MALICIOUS

PDF

33.9 KB Created: 2021-06-21 18:03:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 37944bc5bfa3566b9cd6e7fbe5ac13ed SHA-1: 33bd06fef9b962ca319886e599f3fdea890a33e6 SHA-256: b8a825542f543b7f91bbb8c70372cd89e71511d67f06259768bce32ed633a1fa
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering 'free Robux' or 'free spins'. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be directing users to potentially malicious websites through a link farm.

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 http://netcdn.co/app/431946152/free-robux-generator-com-roblox-hack-game-hack
    • https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/cute-free-hair-on-roblox_GM431946152.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-stuff-links_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/roblox-colouring-in-pages-free_GM431946152.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/best-minecraft-hacks_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/roblox-artmoney-robux-hack_GM431946152.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/minecraft-pe-apk-free-download_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-roblox-exploits_GM431946152.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-spins-link-today-twitter_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-minecraft-hosting-24-7_GM479516143.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/free-spin-link_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-reward-link-2021_GM406889139.pdf
    • https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-2021-free-spins-link-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e8b.bin
6666cb8d99b202b5ef46987b36d6df5d9e8c2c6c43f70edde45d8c0195dd5fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8B 21860 bytes
font_01_sfnt_off00005ec5.bin
b5fe64a349a1260a8bf1e39cb434a35d84e03f20b24c2703f62dd6d7df3547b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC5 19324 bytes

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