Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc55df3496465e7…

MALICIOUS

PDF

36.0 KB Created: 2021-06-27 08:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7f51de4893eb3cd894c77433aa75523e SHA-1: 614d52fb98134b4d4a8048cbd9cfea20a39972aa SHA-256: 3cc55df3496465e71e4da756c10fd8b9712aef5f913e82e5c72c592b928a4840
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to external sites for malicious purposes, likely to download further payloads or engage in phishing. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. No scripts were extracted, but the overall structure points to a downloader or phishing lure.

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 http://netcdn.co/app/431946152/free-robux-proof-2021-promocode-game-hack PDF link annotation
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-logo-t-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/wurst-115_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-hack-no-survey-or-verification_GM406889139.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
font_00_sfnt_off000032d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D5 22828 bytes
SHA-256: eb7fe9b2d541868599104218cf9adc03b9334d7ff750a177e17776d41d717cd0
font_01_sfnt_off000065f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F6 19708 bytes
SHA-256: d2d37d78e460f51f7cf6587bf46ccf868a2552337242eb5a05c8790171f76b76

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