Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e211dfa79fbac0…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 08:32:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7cd26e2da92490c5641009ba380b0117 SHA-1: 935475306172f6e75538492edd89127af516b486 SHA-256: a5e211dfa79fbac02a1f123abfb2ec8154137af4a1d02a1cf022f6ea9353d814
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract users searching for game cheats or hacks. The presence of a direct link to 'netcdn.xyz' and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Robux Hack Me' and a URL, reinforcing the lure.

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/431946152/robux-hack-me-game-hack
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-mobile_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-bit-ly_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-app-free-download_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/no-verification-coin-master-hack_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/spin-free-coin-master_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-mod-apk_GM406889139.pdf
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a02.bin
c5f41355c1636f945a5bb70c22480747c33e66d60e9505f559b4f65335d84ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A02 25864 bytes
font_01_sfnt_off000083cc.bin
63c17dbc7d8c7d1de0ff2471750372836806f4a6a54ec4612fcacbe2caf81c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CC 18444 bytes

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