Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f750b09118092f6…

MALICIOUS

PDF

45.8 KB Created: 2020-09-02 00:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73ee0c00a54b9b9d2f80f3e2bd092b99 SHA-1: d300ff58546d66b9f14e8941aa358e2308d81028 SHA-256: 5f750b09118092f60fa7a5adbc78daf949dd0f11a53e418f0320518530389f54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also features a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to harmful 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.ru/wix?keyword=cdc+guidelines+rapid+flu+testing
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/10a4aa_afa0999176534c0a9cffcb33d5229397.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df28bd05ccb41a399151a157c93f8d6.pdf
    • https://static.usrfiles.com/ugd/b80405_f910bddbea46417ca61213ea9487866c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://static.usrfiles.com/ugd/cac9e4_3fafdeb9f777413290a8199b37dbc430.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_cd03a32a676542388341fe24c1cd3476.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb275e7da9c0471490bf517e1f9ab0d3.pdf
    • https://static.usrfiles.com/ugd/5899d5_5ec2d3c608ee4a33991f0cc4d56b5a99.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/bed_bug_reports_hotels_chicago.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/biblical_worldview_test.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/vevufarupajusesas.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/78088281378.pdf
    • https://static.usrfiles.com/ugd/162fe6_78e7f7d43bea4e29a61c6faa6ac0d143.pdf
    • https://static.usrfiles.com/ugd/08e331_b81d03f39a544d59ae5ae6583fd9da1a.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_off000067c0.bin
b7d586332ec80ecb03b975ca277eef270e155ed5748fa78529b9fb9edda690bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C0 5116 bytes
font_01_sfnt_off00007934.bin
c7537902c27965f0ef88a8eae94a3b4d749566c61d1edb2edd212b1c0d5aec9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 10360 bytes
font_02_sfnt_off00009c73.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C73 4324 bytes

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