Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d44e8ca3315d7fb…

MALICIOUS

PDF

56.9 KB Created: 2020-10-27 18:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e528ff9bd71b0482936d383f38bcf32a SHA-1: 1daa11687621008a888433b76a705bb8c9a06598 SHA-256: 7d44e8ca3315d7fb07a3197286065dd1ca8ee9926d172bcea1587b1ba61dce8a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains or known malicious redirectors. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lead users to malicious content or phishing sites. The primary malicious URL identified is https://cctraff.ru/strik?keyword=digitigrade+vs+plantigrade+fursuit.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=digitigrade+vs+plantigrade+fursuit In PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/fokigaka_lilopez.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/b9035f045bb288.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/xovapi.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/1989684.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5721191.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/gases.pdfIn PDF document text
    • https://mubojage.weebly.com/uploads/1/3/4/3/134377346/lepafenirobizogusote.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/kuxenuxoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd57f32-88c5-4b50-921d-f00b2ce2f4ba/48129839894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63815432-4753-438d-832e-5c1937974595/16793881070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9434e38e-01f0-490e-8f96-22ca6ba3b877/50368964592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6505c4b-ad06-4486-89e8-0d0c84c43f65/wrong_mp3_download_by_luh_kel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/72884294517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/total_cholesterol_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3627ac-941c-4127-a064-85e590c74373/nuwuruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74919df-229e-434f-89e7-f882deb73411/50541047286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0186f8-ebd9-483c-9274-8e77ab94e075/logageburojodureteke.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF5 5268 bytes
SHA-256: 5799c8a43fea37466e556b69fd3188563f36f88f2146fb3dfcb6188ad924b410
font_01_sfnt_off00008cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 2956 bytes
SHA-256: 28277323e542704c787dc035995a6e8b78b96b882c3cc70c46ed52b8a501460a
font_02_sfnt_off0000993f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993F 11428 bytes
SHA-256: 791d65aa4730206778ad726e7aacb7123addf1016acc629643591ede030c55e6
font_03_sfnt_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 16208 bytes
SHA-256: 44b8022c2a84fec3dc397bc3814882f0590d3d8e5f69667e83b3bad4a88aeee6