Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2505019b7b32eb…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 10:21:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 165efeac4fd5c364c4a1fe85ea1208ed SHA-1: 140931fce439082739495ca051e15f730f918d3e SHA-256: 1c2505019b7b32eb41a96e3673e077bedfdfcf8ebfc463caf894eaa82d36b7cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes game hacks and cheats, indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports its malicious intent. Although no scripts were explicitly extracted, the nature of the content suggests it's designed to redirect users to malicious downloads.

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/coin-master-hack-tips-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-cool-marshmello-shirts_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-username-and-password_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-100-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/greenlegocats123-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/counter-blox-roblox-offensive-hack-script_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-change-roblox-name-for-free_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_off00003123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3123 23156 bytes
SHA-256: 04bd744042631f29c0388542a1b00ae2b42a1a72ad59cd5b2d03fd1a1c557e92
font_01_sfnt_off0000652e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652E 18180 bytes
SHA-256: b0883ae95b36653d00b2f12e9570232dc7bb6c108c05f5d6d5c12e7eecef38d8

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