Malicious PDF — malware analysis report

Static analysis result for SHA-256 17355a4f2e80920f…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 20:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e478ded8a5852b279bc029cc7c4a247d SHA-1: f6cf8fadf4bde13adf1a12791bf5d216ac7d3e83 SHA-256: 17355a4f2e80920f37997ff197c42765c9b530df4ae49232ded3263427bfde6f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links, https://ttraff.cc/wix?keyword=length+conversion+table+mm, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to a 'length conversion table'. The ML classifier strongly indicates maliciousness.

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=length+conversion+table+mm
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/362633_83a4d450fc464b7694b9bd24329ab1e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7e4032911c447a1b1c289acb84cc05b.pdf
    • https://static.usrfiles.com/ugd/756799_81caa4f20141447ba797bacc266f037d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a15653272244229a0a2a02fb1223f26.pdf
    • https://static.usrfiles.com/ugd/cc03df_076cd57dd6d149f08e0086b1b4a743ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_1211ecfa8ab64c55be1b62734e7c30b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b2830db5804f10a4d84a83cd59a3a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7a6cfca65204dce83d680068a15a65a.pdf
    • https://static.usrfiles.com/ugd/18f527_3b786a1f7bf74788a2c3eea02ce8e1e1.pdf
    • https://static.usrfiles.com/ugd/40512e_ff4dbf364abb494c9e9b91404759b948.pdf
    • https://static.usrfiles.com/ugd/bb13a2_4fa58f2999884ff5910357c1c77ce2f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d8179d1e34848bc88fe64cc0c54dca9.pdf
    • https://static.usrfiles.com/ugd/26938b_3d26411defc84b5da59f60d021b9da8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ebb.bin
bc27ffcd3a8142ebee2a00f3926d31a6506c5a20db60ab45a266886bd7fb8141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 5144 bytes
font_01_sfnt_off00007010.bin
edb5070af655ceb81bac528be2f8d80d2ad3e912fa324225189cc8866ecbc688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 14128 bytes
font_02_sfnt_off00009b98.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B98 4324 bytes

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