Malicious PDF — malware analysis report

Static analysis result for SHA-256 115113d836cafc7a…

MALICIOUS

PDF

46.4 KB Created: 2020-09-02 06:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf1478984016eba52215ebf952afb2c SHA-1: db33805ca4328d8c4b073e973951976603739ec0 SHA-256: 115113d836cafc7adfc379c083314a0534f120d50560998766e8772732c1e558
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'interview questions and answers' and a URL that appears to be a lure. The presence of numerous external PDF links further suggests a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/wix?keyword=intervention+specialist+interview+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1fa6dd_fb50d7e3cd4f485284e7ebf4756eb737.pdf
    • https://static.usrfiles.com/ugd/b8c837_8614395f95f14a9492019aaa4f76754e.pdf
    • https://static.usrfiles.com/ugd/5bb01c_375ffebe3c3c4a4b925b39d0954ea671.pdf
    • https://static.usrfiles.com/ugd/b8c837_15f594087dc04933bad9918a5812b228.pdf
    • https://static.usrfiles.com/ugd/eb4c03_0fb543070dc64022907e85d2c23486d8.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/76524988247.pdf
    • https://cdn.shopify.com/s/files/1/0457/4422/6460/files/jumble_answers_today_chicago_tribune.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/vonemuvurevidesaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4ddae6f16c24df8802168dbf9c83dd1.pdf
    • https://static.usrfiles.com/ugd/3bcfef_9f1ae8f6debb41a9acb4a3022764c474.pdf
    • https://static.usrfiles.com/ugd/11f207_7a97f17640af485f978b45ff3e4a273d.pdf
    • https://static.usrfiles.com/ugd/fbcb80_910ef97597fa4962ae8aaa0c5d1c31c7.pdf
    • https://static.usrfiles.com/ugd/95bb70_39a5098f936e47d489942a1ea713d1a9.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_off00007834.bin
e42332250fcee17ca0625eac1b691ca28fbec660c729d8e6d259e7ca2e87f7a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7834 5284 bytes
font_01_sfnt_off00008a4b.bin
0d9fed62ab977928ba879f37b0277261131ea6119f364e13499ea58a8a6c2b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 10152 bytes

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