Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea86d9be51b3ab5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 23:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3082c2ef94db3f612355d406c719fac SHA-1: 53f64a12ad3bf68ea99b6400b667c27803ebcabe SHA-256: 1ea86d9be51b3ab57cd3198dd040ecdd6c5bd687126bd3551df7da3988d3f2e0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is designed to redirect users to malicious content under the guise of providing study materials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://ttraff.club/wix?keyword=brilliant+pala+study+material+pdf
    • https://static.usrfiles.com/ugd/b8c837_e5a80f47e18540c9970a3db75374a0a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_baae777784bb4397a14ffd8809009b05.pdf
    • https://static.usrfiles.com/ugd/d3758e_e21cfab80cde4b5d8425c11582b6380c.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/abramowitz_and_stegun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/fewuwigofazubuginal.pdf
    • https://static.usrfiles.com/ugd/4c1554_9dc42eed33414c79b9898d82c0a6f5c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f24ff1533a64c21b18ae3a8e376ed07.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c9e756a72e4480692bad3d296c7bd31.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e615173dc842f485a4b6990aa8b426.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d4996c4c49c4289a8913bc5ffcd4555.pdf
    • https://static.usrfiles.com/ugd/89363e_9878e064f87f44f29d29988edafe5c00.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005114.bin
7c4b55bb2dad0845bc0fb1f7898be260e92d97bc222e170aef29bfe293acd9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5114 5336 bytes
font_01_sfnt_off00006327.bin
b492e9e69e2bcec412c8f84a90abc329041c61bbbe1c339f95c7cabaeea7dd8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6327 10520 bytes
font_02_sfnt_off0000868b.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868B 16164 bytes

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