Malicious PDF — malware analysis report

Static analysis result for SHA-256 87425af8fccfb30d…

MALICIOUS

PDF

42.0 KB Created: 2020-09-30 01:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29cd744c526f93b7e004285d6b30a4cf SHA-1: ef6631a184bd563c7d35b1404d54f47e9403861f SHA-256: 87425af8fccfb30d58224c82c85661d964638cfaf03b70b1aebf31bd300c1203
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious sites. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

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://cctraff.ru/strik?keyword=the+glass+mountain+donald+barthelme+pdf In PDF document text
    • http://petuton.odriscollcollective.com/uploads/1/3/0/7/130775162/winipin.pdfIn PDF document text
    • http://files.bvr-cpaconsultants.com/uploads/1/3/0/7/130739062/safafawun.pdfIn PDF document text
    • http://files.johnregan.org/uploads/1/3/0/7/130776589/loraveziguwujasire.pdfIn PDF document text
    • http://korixefux.drbriancasteels.com/uploads/1/3/1/6/131636825/lekerigalawegazamaz.pdfIn PDF document text
    • http://tiwudibe.chucktingle.com/uploads/1/3/1/4/131407406/7646751.pdfIn PDF document text
    • http://files.serpentinecommunityfarm.org/uploads/1/3/0/8/130814118/9eb792.pdfIn PDF document text
    • http://tavera.medicalequipmentcorp.com/uploads/1/3/1/0/131070581/6322400.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/dunemedurilavirus.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/82717692944.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/1/0432/1958/3138/files/39339116678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/70061660505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/30508502269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/goxemebunazakewenab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/46599420873.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_off000065c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5544 bytes
SHA-256: 8b2edf780ebb23841847b3994c8fb381ceec1deaeb9dbe20e83ec99d8f7f7d47
font_01_sfnt_off0000786c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 10128 bytes
SHA-256: 7b8d866412ccdaacd078d47f5ca8f8f3cb8f19b9498bed05e4018adf6c35a6de

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