Malicious PDF — malware analysis report

Static analysis result for SHA-256 64446511351873e4…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 09:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26743ebde684c9efb647e89551b5e081 SHA-1: 468132f2bc4cacf0faef0644a2267cd84998380a SHA-256: 64446511351873e4ee3848255179e40eea2c92ae13d4be0b14492fef698911a4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to trick users into visiting malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted, but the presence of embedded links and the ML classification strongly indicate malicious intent.

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.ru/wix?keyword=biology+eoc+study+guide+answers+2016
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6f7357_74493c77f5954f9c8bee714e76fa5bbc.pdf
    • https://static.usrfiles.com/ugd/87d215_740cf5bd5f444e2486fdd193daa015f0.pdf
    • https://static.usrfiles.com/ugd/696b8a_359257fa6065493993cb9c9e2ba2a53b.pdf
    • https://static.usrfiles.com/ugd/73f3b0_010ec421d8724622818358ae42dc56ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_2977d4f4b08f41228e7cb93640987667.pdf
    • https://static.usrfiles.com/ugd/8cbfce_71c7de38eeba4f609e4459d19f0fd61e.pdf
    • https://static.usrfiles.com/ugd/b8c837_11a53feb3f1d4891977363a9b9ba0a44.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_695d2d0625164f93a9fd11b18587a79d.pdf
    • https://static.usrfiles.com/ugd/9e41f0_55da5d51d8fc4288ad872f3fdcaa3c84.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_a33f13d813834062a0860cb52c4ee68a.pdf
    • https://static.usrfiles.com/ugd/41a0b6_6c21b0f5e18a45528cc871c9370e8a60.pdf
    • https://static.usrfiles.com/ugd/b8c837_38708ea07c0845c2a202dda7ae14a2e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e3a1a91089740da936be81dd4e13c1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bbad9c8a3194167a5ba6c559356eb84.pdf
    • https://static.usrfiles.com/ugd/b8c837_09ced3a3177e44a4996202eaafbf7633.pdf
    • https://static.usrfiles.com/ugd/8b9728_c076fc9675ff4eca9c544b8357b97f22.pdf
    • https://static.usrfiles.com/ugd/822ecd_4efb816d73d840b0a7429162bba714e1.pdf
    • https://static.usrfiles.com/ugd/4dd980_8bead4d711f349f6b54370de11d9463e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c336f6b72fef46c2bcc4e53015fc24bc.pdf
    • https://static.usrfiles.com/ugd/451461_a5ca58e4682a4b40995afe7f0b002d1f.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_off000055bf.bin
bed0dcc3eb7ca0f5c8a2eaf3f55902fb4dfc8510730fd017cc299bd5015b3083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BF 5828 bytes
font_01_sfnt_off000069ba.bin
0055ed13d68258c83c8bd5d18168f8e9ac7b3a88af8232e4bb2784d5fb04e096		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BA 9768 bytes

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