Malicious PDF — malware analysis report

Static analysis result for SHA-256 35197c42bce2fc67…

MALICIOUS

PDF

42.9 KB Created: 2021-05-10 15:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bf10d7ef358fcc77a48500419d2ffa3b SHA-1: 0cb1ddd8c02da088265d2d93d83628cca9054f69 SHA-256: 35197c42bce2fc676d4293608d8d4f2d31e56f2921d73c56a9ec637148c7d270
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document as malicious. The presence of a visual download button suggests a lure to trick the user into clicking the malicious link, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/i-can In PDF document text
    • http://hospitalsalamanca.cl/images/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://hospitalsalamanca.cl/images/www-roblox-robux_GM431946152.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_off00004127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4127 24848 bytes
SHA-256: 2e66b5e400da0ed039dd9759200ec61a372f8ecb3861a7a3b58f4dd48f2cbc3b
font_01_sfnt_off00007a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A20 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off000086a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A5 17952 bytes
SHA-256: ff0c2fd87def8c3d08bc052d35a059552b69b6ff80e738d461809d40e2b5bde5

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