Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ba135eaeccd691…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 14:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce840330384de8201f86a432a5e9009 SHA-1: 7b11b1592b513c99ae033c99ac5d426761c79b7c SHA-256: 80ba135eaeccd691d6c88e2ee94fa277f24dced860e274e6303af5d8878c0ba0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The embedded links appear to be part of an SEO link farm strategy, aiming to drive traffic to potentially malicious or spam content.

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.com/wix?keyword=dayton+audio+t652-+air
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_aeb05d675a814a1c921afd71bf13eed9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3a3acd1f15404a9c940703016500d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_378f41b42f414a37bd4cc1379b8527a7.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/54394675102.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e8e1677c4d24c3b96da265f62ba50d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_863825a5a5eb4bfab2a242deccf8dd9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b80a51276c4640d8b781c73719c34f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_e11e319da3e944ceb21665370faddd39.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/b8c837_267c64cb94ed4212abc2beb0b1fef955.pdf
    • https://static.usrfiles.com/ugd/b8c837_1da6a373220e4bd8a96f493599bd8d68.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006688.bin
a364607220bbb72ae40234f374cf963801cbd9a1024099d4b4d3ff2acae73e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6688 5152 bytes
font_01_sfnt_off0000782b.bin
8af41fa934a53e0cc1c67bc32c773c2299b3c31087c3a6c144673823e1d6d212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 12132 bytes

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