Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6455b2bb98f4698…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 10:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e9f40c0388a2d4c936c8a3fe98012e4 SHA-1: df09951a486621a8656f616ab5075be94409b1d6 SHA-256: e6455b2bb98f469826b4111e73618ef5a066266ac787a55119496be0f5a59516
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and heuristics indicate a lure for 'free Robux' or game hacks, and a 'MFA / one-time-code harvesting lure' heuristic suggests it may be used for credential phishing or session token theft. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/free-robux-generator-2021-no-verification-game-hack
    • http://ghi.dk/billeder/coin-master-hack-without-human-verification-india_GM406889139.pdf
    • http://ghi.dk/billeder/coin-master-freebies_GM406889139.pdf
    • http://ghi.dk/billeder/play-coin-master-for-free_GM406889139.pdf
    • http://ghi.dk/billeder/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdf
    • http://ghi.dk/billeder/free-robux-hack-us_GM431946152.pdf
    • http://ghi.dk/billeder/coin-master-heaven-free-daily-spins_GM406889139.pdf
    • http://ghi.dk/billeder/roblox-hacks-and-cheats_GM431946152.pdf
    • http://ghi.dk/billeder/easypoints-gg-roblox_GM431946152.pdf
    • http://ghi.dk/billeder/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://ghi.dk/billeder/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://ghi.dk/billeder/free-minecraft-packs_GM479516143.pdf
    • http://ghi.dk/billeder/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://ghi.dk/billeder/how-to-get-free-robux-com_GM431946152.pdf
    • http://ghi.dk/billeder/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://ghi.dk/billeder/coin-master-free-spin-ml_GM406889139.pdf
    • http://ghi.dk/billeder/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • http://ghi.dk/billeder/coin-master-free-cards_GM406889139.pdf
    • http://ghi.dk/billeder/coin-master-daily-free-spins-blog_GM406889139.pdf
    • http://ghi.dk/billeder/chisel-and-bits-mod-minecraft-pe_GM479516143.pdf
    • http://ghi.dk/billeder/hack-coin-master-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b9.bin
c3493750a22f2ffb2b88cfb78b2b626b6d4ab15a8aa692f72b47380a084d0808
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B9 25908 bytes
font_01_sfnt_off00008b4d.bin
eaf568d7ea0a044e872f94ae97e774b330aded4a125b331f779931cf2648d6d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4D 19004 bytes