Malicious PDF — malware analysis report

Static analysis result for SHA-256 c005ec657529af4c…

MALICIOUS

PDF

44.3 KB Created: 2021-05-11 06:07:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 60d4823d1375f31581a3605846e4fa79 SHA-1: 2e87ceda22c00b8715a659de8a3636f12a50b2a5 SHA-256: c005ec657529af4c8a5171122da0b44e50cdaa7c7574508a8ba5638c5ff5fdce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are related to free Robux and game hacks, indicating a link farm designed to attract users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful websites. No scripts were extracted from this sample, but the overall structure and link farm heuristic point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-games-that-actually-work-2021-game-hack
    • https://weddingcards-expert.tw/upload/files/free-robux-redeem-codes-2021_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/coin-master-ios-hack-download_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/free-roblox-clothes-boy_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/how-to-hack-to-get-robux_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • https://weddingcards-expert.tw/upload/files/is-minecraft-free-on-ps4_GM479516143.pdf
    • https://weddingcards-expert.tw/upload/files/free-robux-no-offers_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/hack-mod-coin-master_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/coin-master-free-blogspot_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/free-spins-on-coin-master_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/minecraft-hacked-client-download_GM479516143.pdf
    • https://weddingcards-expert.tw/upload/files/roblox-hack-com_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/robux-link_GM431946152.pdf
    • https://weddingcards-expert.tw/upload/files/daily-free-spin-coin-master-link_GM406889139.pdf
    • https://weddingcards-expert.tw/upload/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a0d.bin
ed7d8cc6e3685ee23a363816d9ef9677e73b30728fbb9213ab949c8464d61ba4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0D 26560 bytes
font_01_sfnt_off0000868d.bin
825df7cf396e8d9c124972fb8483e304b72a256d7e3507e7d5ad5df48b88867f
pdf-font-stream PDF embedded font (sfnt) at offset 0x868D 19796 bytes