Malicious PDF — malware analysis report

Static analysis result for SHA-256 6858628ecd606b96…

MALICIOUS

PDF

44.5 KB Created: 2020-09-19 03:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca021d214c01c18a4cbd081913e62b0d SHA-1: d8733d58f98ff384fcffca9d9d4dd82fffaf144e SHA-256: 6858628ecd606b9692f600b6f9fd472e6052505d744553ae37ea91500c6d407e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same malicious URL. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing.

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.me/wix?keyword=artificial+selection+dogs+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b579d422-ce6b-43ab-bdec-8a0bb62930f1.filesusr.com/ugd/2eec94_83fe353a906d44eb9d4fbf91bafb7837.pdf?index=true
    • https://400f70b7-af60-42fe-ab39-eae50d0e4445.filesusr.com/ugd/b5973a_125e4cbaf454477c827a56f1593eb5d8.pdf?index=true
    • https://50605625-e696-4bf9-b04e-c54d4e83d7c6.filesusr.com/ugd/dcbeda_371a89bfd9e847febf8ab6a94ec5b2af.pdf?index=true
    • https://0c4351cb-2344-407c-91de-bb74ae937ad5.filesusr.com/ugd/f63f29_9a5a95185a43496fa53ea52d8aea32da.pdf?index=true
    • https://cf9b9d81-1c3d-4bf9-becd-bfe219d19bbd.filesusr.com/ugd/078c79_d4076970890f4b4e837a7bcb14bf655f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/zetizuxomixegiketasiji.pdf
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/4616524280.pdf
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/vatekigaganixegivemema.pdf
    • https://cdn.shopify.com/s/files/1/0481/6257/0393/files/nr_nst_medical_abbreviation.pdf
    • https://8341c07f-e293-4c91-acab-f83b07507d7c.filesusr.com/ugd/8d57bd_f9b53f8cc2e4436d83113bdc8372c0f1.pdf?index=true
    • https://fc46140a-da84-4d40-9240-d0e41a0e17a2.filesusr.com/ugd/2d797c_577decd245564778a707b2d180e14473.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0460/3310/9156/files/kevugudamatapasonopul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/nukatexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/24830269087.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/suruwewenakesemowemof.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2919/files/harnett_county_inmate_population_report.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_off00006ffc.bin
3731e3a23e2bb21d2d127fa8f4ac70fa5c4016a129cf28a9609b730d89f8a786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 5428 bytes
font_01_sfnt_off00008278.bin
6e5d9f654cbc912f55fec622bc3c25a24c99bd6820c79f4cc4d4772b0767714b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 10120 bytes

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