Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2a420bda1f2fdf…

MALICIOUS

PDF

48.4 KB Created: 2021-06-10 17:20:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2db050c146fc1513f1acbb0b4c76f26a SHA-1: 2fa248bd0866bcb0829a95cf8ae45d5781bcd013 SHA-256: 5b2a420bda1f2fdfec08bbd0c2b5a98e5f8339b1fa5d8b5e558a08fd81dd8eb6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to various websites offering free in-game currency and items. The primary URL, https://netcdn.tw/app/431946152/robux-pin-free-no-verification-game-hack, is directly associated with the document's apparent lure. The presence of a 'download button' heuristic further suggests a deceptive workflow designed to trick users into visiting these external sites, likely for phishing or scam purposes.

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/robux-pin-free-no-verification-game-hack
    • http://library.yamasi.ac.id//repository/pokemon-go-for-free_GM1094591345.pdf
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/coin-master-homepage_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/how-to-earn-robux-fast_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/robux-gratis_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/free-robux-without-offers_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/coin-master-free-2021_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/free-robux-not-a-scam_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/free-coins-and-spins_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdf
    • http://library.yamasi.ac.id//repository/coin-master-hacks-no-human-verification_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/dailyrobux_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/minecraft-free-play-now_GM479516143.pdf
    • http://library.yamasi.ac.id//repository/coin-master-exchange-40-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ea.bin
6c85924bd25a77223cbbbe0a56a85878b8572b1650d5d650a2907838723c3123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53EA 25988 bytes
font_01_sfnt_off00008db6.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB6 3400 bytes
font_02_sfnt_off000098df.bin
9cfc4c8952227c230aec68691beaf0fdced516eb1ea0f904e5b022f116307a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DF 18756 bytes

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