Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd651c1e18341ab1…

MALICIOUS

PDF

45.7 KB Created: 2021-05-16 10:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1b42983d41c138a06af72c094f795a6c SHA-1: 8f0e45c1823c9f63d50aecdd7b48c812bd891f57 SHA-256: cd651c1e18341ab1018d8f8d2fb38bcff6cc9953e06610113f0ee3e70c4a2bb3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The document body and extracted URLs indicate a lure for game-related cheats and hacks, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-daily-free-spins-link-facebook-game-hack PDF link annotation
    • http://sbm-nn.ru/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbx-earn_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC7 24840 bytes
SHA-256: 56f38ea427a48bd400597e3561600c5005045d190db4181c01d1bcd0e59e4d48
font_01_sfnt_off000082eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82EB 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 18636 bytes
SHA-256: 50d107b0548bd3d005e8b5e4f9cf847a43b3082c8a2089b5591d39299d79db66

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