Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec63ad282e768e5…

MALICIOUS

PDF

49.9 KB Created: 2021-06-08 12:23:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6c8801c8717b43435797623a637e36aa SHA-1: 295c96db37e5094856339db3448f0c14e34072d3 SHA-256: 6ec63ad282e768e55a0251260942e75a8833cda40e7c2ccab915167b42210855
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm strategy. One prominent URL, 'https://netcdn.tw/app/431946152/how-to-become-builders-club-on-roblox-for-free-game-hack', suggests a lure for potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-become-builders-club-on-roblox-for-free-game-hack
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-modded-minecraft-server_GM479516143.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-tiktok-fans-and-likes_GM835599320.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/minecraft-free-download-pc_GM479516143.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/is-minecraft-bedrock-edition-free_GM479516143.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-roblox-clothes-girl_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/roblox36com-free-robux_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-minecraft-worlds_GM479516143.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/blox-fish-free-robux_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-tiktok-followers-without-verification_GM835599320.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/robux-hack-no-verification-no-survey-no-download_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/robux-hack-tools_GM431946152.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/free-tiktok-followers-without-human-verification_GM835599320.pdf
    • http://e-learning.mtsn15ciamis.sch.id/__statics/gudangsoal/files/tiktok-free-views_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055c7.bin
fdf7114fc1922eeee0b6280cb9d7f1afcbce1cf5b3a14cfa133e6452cc18c952		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55C7 28176 bytes
font_01_sfnt_off00009535.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9535 2832 bytes
font_02_sfnt_off00009ee5.bin
4081fb2666c0fbf2472fa3e40b185f6a3f0b530e8ed9480b6b9c651fb1ccdd29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE5 18808 bytes

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