Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1595a4d7eceda1d…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 22:00:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1c95f5eb1d4e263f7f755e80aae5e2a6 SHA-1: 6a1274aa38e12c1fce4cc431185949147936325f SHA-256: a1595a4d7eceda1d2baf38697b7b8e00f382b1930992f9fdf80400eb2ef7b7a1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

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/479516143/is-minecraft-free-on-pc-game-hack
    • http://lib-smansumsel.sch.id/repository/can-you-give-me-free-robux_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-spin-free_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-ios-2021_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdf
    • http://lib-smansumsel.sch.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-links-2021_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-app_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-cheat-codes-free_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdf
    • http://lib-smansumsel.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/25-free-spins-coin-master_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-free-pet-food-links_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/robux-no-human-verification_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/coin-master-free-download_GM406889139.pdf
    • http://lib-smansumsel.sch.id/repository/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://lib-smansumsel.sch.id/repository/https-rbx-place-rewards_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c87.bin
071221b70610c5fccec2a911f597a0f013fa54d57539775be48ffa8fd7d3c480		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C87 25016 bytes
font_01_sfnt_off000084e2.bin
0ab36ec9301b9393cdac417675da6d9cb227c8d57ccc288e3f382d638798bb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E2 17724 bytes

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