Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8712fa86f253dc0…

MALICIOUS

PDF

34.9 KB Created: 2020-09-10 16:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04217560c730c8ebf3868cf2f21f4197 SHA-1: d2c1d61a8bebdfd564fc09ae97ef78290883e299 SHA-256: d8712fa86f253dc0659acb1089588ad409597c2426eef3a9123297592e6eff79
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm designed to obscure the ultimate destination. The primary link, 'https://ttraff.cc/wb?keyword=geberit%20monolith%20plus%20montageanleitung%20pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains what appears to be a URL, further supporting the malicious redirector hypothesis.

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.cc/wb?keyword=geberit%20monolith%20plus%20montageanleitung%20pdf
    • http://xeximus.forkemporium.com/uploads/1/3/1/6/131606457/f1972.pdf
    • http://zivegaxef.awinecountrywedding.us/uploads/1/3/1/3/131380005/9392005.pdf
    • http://files.natalieasport.com/uploads/1/3/2/6/132695575/podukurupo.pdf
    • http://bavebup.lakecountyiltransition.com/uploads/1/3/1/4/131438539/9653562.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_3e2f6ab32bfb4157b61490db3b1e4260.pdf
    • https://static.usrfiles.com/ugd/943725_c468e6fa511a4621aa128b2e0864c1d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9871661708467aadf8c849b8467d8d.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_3ed1f92c5a2e460a84661878b3772d63.pdf
    • https://static.usrfiles.com/ugd/10a4aa_117f919b74ac4cbb9f17929f1709ef8d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90142435821.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/big_bang_theory_seasons_1-_8.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/zudikipazetotilezodazexoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/sawoxuxel.pdf
    • https://cdn.shopify.com/s/files/1/0434/9932/3558/files/barriers_of_cross_cultural_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/defunof.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_off00004997.bin
991d3b402e8928fe087750657b8707952cca2ad41edb6625f8e5fea64af1aef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4997 5624 bytes
font_01_sfnt_off00005c7f.bin
3545026dec30a30f9c3c91a80582d24f3035a1329390f2dc6243f6246486c001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7F 9916 bytes

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