Malicious PDF — malware analysis report

Static analysis result for SHA-256 f743d0643cef4e49…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 05:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a22e0b0ae989475d484ea2d8ea4f3a8 SHA-1: b121abeb334897f6cd4725b5c8a33342a310927e SHA-256: f743d0643cef4e495be354e8991d90e57116e828e3556da09c83398c7a58fc9a
120 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 direct users to malicious sites. One of the embedded URLs, 'https://ttraff.com/wix?keyword=caflisch+script+pro+bold', is flagged as a known malicious redirector. The document body itself is heavily obfuscated but contains references to the redirector URL and other PDF files hosted on 'static.usrfiles.com'.

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.com/wix?keyword=caflisch+script+pro+bold
    • https://static.usrfiles.com/ugd/f09a9d_8ae14fa1d20b49ceb3666740301a3c4d.pdf
    • https://static.usrfiles.com/ugd/82e28d_eb0033260a4244fe80eea92fe789a52a.pdf
    • https://static.usrfiles.com/ugd/ba3095_c6b23f1863f14f80bd206de44b32fb85.pdf
    • https://static.usrfiles.com/ugd/451461_2854b0e70cd34df39660fd5f3979a37f.pdf
    • https://static.usrfiles.com/ugd/a59130_cdcfad15af5d4203ad4306b79d083f59.pdf
    • https://static.usrfiles.com/ugd/b8c837_44c3674a0c66403ca75959140734932c.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/formule_barycentre_de_2_points.pdf
    • https://cdn.shopify.com/s/files/1/0430/1294/8121/files/rupejotise.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/zawepune.pdf
    • https://static.usrfiles.com/ugd/58a813_30f850dfb4b842659b7d206bd8ad87e1.pdf
    • https://static.usrfiles.com/ugd/95089d_ce1851937c2248e38e671d05dd0321f9.pdf
    • https://static.usrfiles.com/ugd/067ecb_ff06ae69f5964d508bf0a5220b1b9a0f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004774.bin
05b500bcbe04547a2457d446e365e2e4f9983895708db24c23fed917774e5d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4774 5288 bytes
font_01_sfnt_off00005958.bin
1f3eda9faf01e639ff3c3ff3515ff44c8aba6f057c1214db7350dde34eb17fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5958 12632 bytes

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