Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc7bd36558a418b…

MALICIOUS

PDF

43.8 KB Created: 2021-05-17 19:42:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a65103f2dacd738e548c6bde0b735246 SHA-1: 598978c77d10cb6307c8e1b2e40273479dd2b51f SHA-256: 6bc7bd36558a418bb6411d4cbda6378aed3f4b912b286f513bd96474cd4f643a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/coin-master-free-spin-links-december-30-2021-game-hack PDF link annotation
    • http://www.sfakia-online.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/freecoins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-roblox-premium_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
stream_003_off0000465b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x465B 28708 bytes
SHA-256: 91b69056c024c0a7c5aaadfff9fb45f1b546c9f276d5a5f3ec9882d997b77f8c
font_01_sfnt_off0000863a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 19216 bytes
SHA-256: 1dbe36d510364522962f6a70e6f7eef96e8f8e931686e1b7e724a642dc91dfe1

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