Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd1de4179e53d19…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 05:06:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bc200a5e995de620abf61059387dfbea SHA-1: 40a04671c72070c7a7d933ed2ffe153df9f0a0c5 SHA-256: ffd1de4179e53d19c6fff5fc3baf474120bdf82b7d3db5baf24f455518062cd6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are structured as a link farm for SEO purposes. The document body and extracted URLs suggest a lure for free Robux or game hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-generator-no-verification-2021-game-hack PDF link annotation
    • http://www.thecoffeebaron.co.za/images/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.thecoffeebaron.co.za/images/how-to-get-free-robux-without-verification-2021_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
stream_003_off00004729.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4729 26304 bytes
SHA-256: c41f735bb30e7c6d1034b99b679d596ad1ee0b444f550619d2d31294b403a88b
font_01_sfnt_off00008302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8302 19004 bytes
SHA-256: d45ec0ea85e3f4da21cb27ccd2cd6df352304457fff04a0939a67aeffe4f8bf1

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