Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a3468f13caf479…

MALICIOUS

PDF

44.3 KB Created: 2021-06-07 15:51:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f8c0efe6db2cc77bfba4224403a5f3ff SHA-1: 14749a69ac75fc013c3e5d46104496a635b0cbdd SHA-256: 91a3468f13caf47927c98dd126dbd8026fd2c373f7199a2087f69e2bf2aff484
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are structured as a link farm pointing to SEO-optimized PDF files related to game cheats and hacks. The primary URL, https://netcdn.tw/app/431946152/roblox-esp-cheat-engine-game-hack, suggests a lure for downloading game exploits. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

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/roblox-esp-cheat-engine-game-hack PDF link annotation
    • http://ines.co.rs/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-2021-sylvester_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E46 25768 bytes
SHA-256: 519288a865d707d57e7f5b082ab14e58cea74788d01a706734847e5112dfeeff
font_01_sfnt_off000088c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C1 18868 bytes
SHA-256: 21ac88c36f0cfea2262983e904af5f5e5eff341e71b14627033e14eac5aec277

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