Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73c8e99e231a5de…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 01:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ba90ec21c5cba2600ea77bbbbf3b20 SHA-1: 5642be23d6750f02575a329fe4facbf508baa75b SHA-256: f73c8e99e231a5dec07961db5f3aaf5dde2abb3a6605dd478b1a2dadea7ad6e4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning or to distribute malicious content. One of the extracted URLs, 'https://ttraff.cc/wix?keyword=11.+s%25C4%25B1n%25C4%25B1f+matematik', is flagged as a known malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=11.+s%25C4%25B1n%25C4%25B1f+matematik
    • https://static.usrfiles.com/ugd/b8c837_49007b2c08644b9cad967043ba02019c.pdf
    • https://static.usrfiles.com/ugd/b8c837_93b387b90d8041d1806cdeb586303db4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1649157441a143e9b41e4bcc65abc0a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_def380d5552e418d82c97d6d4a3e69fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_65257470cdfa4353843b286775c9c074.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a0e5c92cab94dbdab4a6c36a4127354.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3c1d65ba4fa411aa6448037372a4910.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2a6e93f746349e2a2f916509cd70a79.pdf
    • https://static.usrfiles.com/ugd/b8c837_3779e1ff77d548e4b8f32dba99ca3db1.pdf
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3893e123da54d9893a167f3cf863578.pdf
    • https://static.usrfiles.com/ugd/b8c837_11aa4c9333a142c0af0c7741f0e27970.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa9ca426d15349f3a5bc093628f85eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_24929345fbb940dbb2dee78f07c4ccf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d99c5cff958414d9f97e2035af8e32a.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_off00004c1d.bin
69bfc7f386fabf1d61a06339e78d294cfe52af5011fd99fe4ec5ca64e97879a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1D 4868 bytes
font_01_sfnt_off00005c9a.bin
e9fab4f968e22f1ef974caada1c43d931833e040cc5ea1e63a97bbc13d1a12a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9A 3020 bytes
font_02_sfnt_off0000695c.bin
d107c25a0c0d873828f957ef47e4957e9d6a06fe0df3fbefa6794c1f89e4429a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695C 11576 bytes

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