Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65d648c5d807df1…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 02:43:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c85a6ba659798b3d9f399eb4d332d7d SHA-1: 12995d34a3471f10ec2d35cca7364e5b388d658f SHA-256: c65d648c5d807df17d57d4e3f4cb469b48ced1db940ec9558d480cba0b3b7eb8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a specific external link, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful content.

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.tw/app/406889139/free-online-spins-coin-master-game-hack PDF link annotation
    • https://digilib.stikesindramayu.ac.id/repository/hack-roblox-free-robux-pastebin-com_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/best-hack-for-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/comment-avoir-un-speed-hack-et-des-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/best-roblox-games-with-free-beatbox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/pokemon-go-free-accounts-2021_GM1094591345.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-download-a-swearfree-roblox-speech-plugin_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/youtube-how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-bc-accounts-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-install-wearedevs-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-use-cheat-engine-with-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-shirt-shading-free-shipping_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-safe-roblox-injector-for-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/all-roblox-eggs-2021-hack-pastebin_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
font_00_sfnt_off0000324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324B 22948 bytes
SHA-256: a50c7020d40f1484ddffe8e640390be2fccf8da5f86be94a64e1fdac27a57dec
font_01_sfnt_off000065af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 18248 bytes
SHA-256: 69f566190966a66c1fe8ab6bbc8550b86d8e85ebd5e604a82219f2cafac13777

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