Malicious PDF — malware analysis report

Static analysis result for SHA-256 90474ba7d98b84b0…

MALICIOUS

PDF

43.0 KB Created: 2021-05-14 09:58:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8e475d8ca4f0b467b75a9a1c80e66eec SHA-1: a8d0a195e81289da964a7a468e1a90cfc95073b0 SHA-256: 90474ba7d98b84b0ad97244a0fea83fdb882228f73d4e597f8817121248beeb7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm with numerous URLs pointing to other PDF files, likely intended to deceive users into downloading them under the guise of game cheats or hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'ML_NYX_PDF_MALICIOUS' model strongly flagged the file. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-free-spin-and-coin-link-haktuts-hacking-news-game-hack
    • http://rollipolli.hu/userfiles/files/coin-master-hack-app_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/minecraft-hacks-list_GM479516143.pdf
    • http://rollipolli.hu/userfiles/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdf
    • http://rollipolli.hu/userfiles/files/coin-master-cheat-to-get-free-spins_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/claim-coin-master-free-spins_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/mcpe-optifine_GM479516143.pdf
    • http://rollipolli.hu/userfiles/files/robux-generator-without-human-verification-2021_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/coin-master-card-collection-hack_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/coin-master-free-spins-and-coins-today_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/roblox-free-hats_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/free-robux-app-real_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdf
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/earn-robux-today_GM431946152.pdf
    • http://rollipolli.hu/userfiles/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b71.bin
b75ea3a01a1e7093eae10a9855bf501149cdb2a4e2eaa166767dc6912efcedad
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B71 24516 bytes
font_01_sfnt_off00008406.bin
ef8f09fc3c17cc4f26b4837a2aef37de344b1ca430b1a31f5cb27c991d5625de
pdf-font-stream PDF embedded font (sfnt) at offset 0x8406 18824 bytes