Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0b7478fb8d9242…

MALICIOUS

PDF

65.6 KB Created: 2020-11-09 07:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4a38bab1fcbebb94e50f633a80047d24 SHA-1: 852ac8ec362486a661db1e60d0a4b309fd732301 SHA-256: eb0b7478fb8d924221f33d5b9430542dc1c1a3a8ea9bfded9be3c62a3cdb3580
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious URL, 'https://traffmen.ru/123?keyword=swtor+jedi+sentinel+combat+build+6.0', is identified as a malicious redirector. The document body, though partially obfuscated, also contains this URL, suggesting an attempt to lure users to this site. The ML classifier strongly flagged this PDF as malicious.

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://traffmen.ru/123?keyword=swtor+jedi+sentinel+combat+build+6.0 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f95e1ce62343.pdfIn PDF document text
    • https://lovunekigip.weebly.com/uploads/1/3/4/6/134685916/tobuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f9f3b6a920f8.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/tedan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_5f9ee6a8b4fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fa79df13f0bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jominetiku.files.wordpress.com/2020/11/happy_birthday_ukulele_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/puwenigavuzi.pdfIn PDF document text
    • https://zukodofi.files.wordpress.com/2020/11/49802617748.pdfIn PDF document text
    • https://nuzobelesuli.files.wordpress.com/2020/11/pearson_geometry_textbook_answers_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/disney_world_cast_hub_login.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_off0000c147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 5824 bytes
SHA-256: 583fab39b60bfee1fe46839a89aab8faff283099853bd4064bf991bf3cbe436c
font_01_sfnt_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 10736 bytes
SHA-256: 0d39c834a0bbf51bf1a85fd34208dacc7b3aef90826df43ab638be55555a9b32

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