Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b5e3e7e40b5212…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 03:06:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d398212ce6d7d9af3a91b504b755c9dc SHA-1: 164ff27366bbd132cdfad097e0490a001270bbc4 SHA-256: b3b5e3e7e40b5212d0187aedc645522309433ce80aabd20cb525430ed43b289a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to attract users searching for game cheats and free in-game currency. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to deceive users into clicking these links, likely leading to malware or further phishing attempts. While no scripts were directly extracted, the PDF structure and embedded links suggest a social engineering attack.

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/master-8-ball-pool-free-coins-game-hack
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-ios-app_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/coin-master-free-gift-cards_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdf
    • https://library.stikesmi.ac.id/repository/coin-master-heaven-links_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/what-is-coin-master_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/coin-master-free-coins--spins_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/hack-coin-master-apk_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/free-spin-coin-master-app-download_GM406889139.pdf
    • https://library.stikesmi.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/minecraft-texture-packs-free-download_GM479516143.pdf
    • https://library.stikesmi.ac.id/repository/free-robux-master_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/free-robux-on-phone_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/mcpe_GM479516143.pdf
    • https://library.stikesmi.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/free-admin-roblox_GM431946152.pdf
    • https://library.stikesmi.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • https://library.stikesmi.ac.id/repository/minecraft-java-hacks_GM479516143.pdf
    • https://library.stikesmi.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047bb.bin
b199da8e6fea5ebc11d0af33922dcf532304332fb8fd9f26894a06b999e11290		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BB 25288 bytes
font_01_sfnt_off00008281.bin
6e0a537e63e8d7ae493ffba7f694c0e5cbb50b5e44b8f04c82ad864b2eef269a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 18364 bytes

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