Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d61d6510fce5dba…

MALICIOUS

PDF

44.3 KB Created: 2021-06-11 00:38:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 38ffe5eecd1e16ca3b22208a6f1913f7 SHA-1: f22cb40ccc8a6ae98468d59bb3ba95d157a8c7ec SHA-256: 7d61d6510fce5dba102637bd37221c5a62496020d13ddd62bec5d443ca12ea20
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious document, including a high ML classifier score and the presence of numerous external links. The document body and extracted URLs suggest a lure for free game-related content, likely to trick users into downloading malware. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, increasing the likelihood of a malicious download or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/rolox-free-robux-game-hack
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-coin-and-spin-link_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-roblox-girl-clothes_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/gameoffice-net-hack-coin-master_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-game-android-free-download_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/i-want-robux_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/minecraft-toys-for-free_GM479516143.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/roblox-get-boombox-free-cheat_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-roblox-gift-card_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/trial-roblox-cheat_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/does-coin-master-hack-work_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-spins-2021_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-roblox-accounts-that-work_GM431946152.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/coin-master-daily-spin-link_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • https://mtsn4kukar.com/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005184.bin
6a579db37df2b3756f23b36df53636cd790f31bdfd1c17c92d59583af3bf17d2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5184 25368 bytes
font_01_sfnt_off00008b57.bin
3a0f3b95d892ff9390c4a9c0327f7ed6705bd9b34f6ae8b77ee7f9a1de3c5792
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 18088 bytes