Malicious PDF — malware analysis report

Static analysis result for SHA-256 846d773d845edc2f…

MALICIOUS

PDF

34.9 KB Created: 2020-08-24 09:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c39b3f4d6783034a9ab61f2da1c5772 SHA-1: 9f6ea5d31f839aac1207d473873c3d2599b85a15 SHA-256: 846d773d845edc2f94aea4909b9ac2ec3c7a23f9f29f76dbbc1473e9637726c1
162 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, suggesting an attempt to disguise malicious content as a study guide. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=arborists+certification+study+guide+third+edition+pdf In PDF document text
    • http://files.jaystinybrain.com/uploads/1/3/0/9/130969297/tumosebunifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0783/5292/files/russian_fighter_aviation_week_and_space_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/73355060748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kividerinogofigizunewif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/47541687345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/56616752051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5611/0487/files/biology_notes_for_class_11_chapter_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/aetna_better_health_of_pennsylvania_appeal_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/jajusorizebadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/19223830524.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000476a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x476A 5616 bytes
SHA-256: dd6d5f546880fc7a17e149be12e759ba587f8ddffb63f9ee4400ce77a31e7734
font_01_sfnt_off00005a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A79 10108 bytes
SHA-256: 7bfea736b1a2abb3963d56f92e293dfbd5a0b91adf8a7b2f6e7e0d77a4587978

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