Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ef17a6097fc18a…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 21:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b88dfa34eb6d1e885f9c497d247f6cdb SHA-1: 0db49b63b73e376043d4a0df847fb03641278f6e SHA-256: 70ef17a6097fc18a6f14c8d0b0bfb21655882ca082c7123e5012948931aa7e79
154 Risk Score

Malware Insights

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

The PDF document, disguised as a tutorial on making wooden windows, contains numerous embedded links. One of these links, https://ttraff.cc/wix?keyword=como+hacer+ventanas+de+madera+paso+a+paso+pdf, is identified as a malicious redirector. The presence of a large number of external PDF links, many of which are benign, suggests a link farm or SEO manipulation tactic, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=como+hacer+ventanas+de+madera+paso+a+paso+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b91566_d3244f468e684585a2bd1d92c59c3720.pdf
    • https://static.usrfiles.com/ugd/3b7182_00f381388f844826ad89e1030cc94fe5.pdf
    • https://static.usrfiles.com/ugd/221f3a_54302141956241b7b68867406c8774c0.pdf
    • https://static.usrfiles.com/ugd/f3cb45_bfdeea74ff6841f79e6a6e892106ebb7.pdf
    • https://static.usrfiles.com/ugd/97493d_e42d5188448f45808ebcb98f7dc33fd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0c8a07c63bc4490848aecc2d8d2a1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba8a1ac2bf444e3cbfaadd51892c3988.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e29c1580c904fb5afabe02370fb5898.pdf
    • https://static.usrfiles.com/ugd/d17951_ef83bb07e0d0426686ca3bf499681f82.pdf
    • https://static.usrfiles.com/ugd/5e8de6_8af3ff72fbcd4955a827310d41c3eadc.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2423/files/karudawijudemipopufon.pdf
    • https://cdn.shopify.com/s/files/1/0441/3010/7544/files/difijanutasusaxijud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/bullismo_scuola_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/1451350852.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/27742228114.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/capm_practice_test.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_off00006f83.bin
209942414c11eaa71710745f7c535e2b2f9656f9cb0efd471d7ccad0902dda68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F83 5328 bytes
font_01_sfnt_off00008178.bin
15dee3531f9677ab9e667fa2510e3e1325330ea5429c8830ded085ed0663c7f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 10268 bytes

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