Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d420e8764634f3…

MALICIOUS

PDF

55.5 KB Created: 2020-10-31 16:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4c0e740ada22618d78d5abde8a7ef4b4 SHA-1: e6f199d2afbf6576cc6d3166f0fc70d5635338de SHA-256: 99d420e8764634f3239d489c854e47f3da484c8cb3889f2e37d2b86b74591801
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains a URL that appears to be the same redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly indicates maliciousness.

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://ggtraff.ru/strik?keyword=gizmos+student+exploration+calorimetry+lab+answer+key In PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/e773b5c.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/tekisaju.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/rutekonenezosovig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5f8c22cd2f5eb.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/fagisupovoja-joxozu.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/dunonefowunoxubelob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/charlie_and_the_chocolate_factory_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa6b4c3-962a-4bae-9ce3-ad765b668150/50374567606.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/691866144.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/ditozajafafaxati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e6cdac-4e96-4c31-a5d1-6d710277225f/81001679616.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/interaksi_obat_antasida.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/pejudatezew.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_off0000947d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947D 5768 bytes
SHA-256: 5e4f22ad6bd8031f1a71d7cb5eb65ececd6ab34db73e17053f4a1c2939108752
font_01_sfnt_off0000a82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA82D 12000 bytes
SHA-256: 4d49d992d605236982ddfcb0fde075f94fb0dbd2643b0cd37c8127980a2154a0

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