Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3753f6eb3375cf…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 08:14:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5b30f0e16010f3188696e6c0cda2c33 SHA-1: 59bc1c78ff93c434fb094b6165336e33447b261c SHA-256: 6f3753f6eb3375cf81db005dc93d6a0b9cdb9a8bca98865151539e71ec832b15
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, indicating a link farm or SEO spamming attempt. The presence of a download button lure and the ML classifier's high confidence score suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-robux-wiz-game-hack PDF link annotation
    • http://gc-sistemas.com.ar/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-much-pokemon-go-free-account_GM1094591345.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-roblox-game-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-to-get-free-coins-in-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/hack-robux-ohne-cheat-engine_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-website_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/infinite-jump-hack-roblox-download-in-discription_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://gc-sistemas.com.ar/images/free-robux-generator-for-roblox-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_004_off000052ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52EE 24340 bytes
SHA-256: 7b31f68bc1b720629790a58104e40a20330c679e9b3390e4db2a27542f87e213
font_01_sfnt_off00008a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A77 18416 bytes
SHA-256: 26a65467a9ba007a80fe27b5a482e9c12568ff79f484022173fcfb5a9e2e6109

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