Malicious PDF — malware analysis report

Static analysis result for SHA-256 577ed025fc5a49f4…

MALICIOUS

PDF

39.3 KB Created: 2020-10-04 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c0a1c70030c6b8098ae3e9466d1c2ae SHA-1: 66d0b0f432247ffc02465afc0477b5ca7f8fc3df SHA-256: 577ed025fc5a49f45d2a9450226e05cbcd34ffeb85f1ad37cac7a2be7788934a
164 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a lure to download further content. The ML classifier also strongly indicated maliciousness.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=textbook+of+family+medicine+pdf+free In PDF document text
    • https://site-1037911.mozfiles.com/files/1037911/50350563506.pdfIn PDF document text
    • https://site-1036924.mozfiles.com/files/1036924/36497752504.pdfIn PDF document text
    • https://site-1039921.mozfiles.com/files/1039921/42047110492.pdfIn PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/18562100650.pdfIn PDF document text
    • http://vekuwe.fbcpas.net/uploads/1/3/1/4/131408832/a95844.pdfIn PDF document text
    • http://files.fbc-kva.org/uploads/1/3/1/3/131398286/nuwimuvuj.pdfIn PDF document text
    • http://zemuku.dogtrainingbyhaywood.net/uploads/1/3/2/6/132680831/finosipabigiz.pdfIn PDF document text
    • http://pijuz.cleanlifesupply.com/uploads/1/3/1/1/131163782/cb4d2ad2.pdfIn PDF document text
    • https://site-1044151.mozfiles.com/files/1044151/11134933992.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/90866901716.pdfIn PDF document text
    • https://site-1039494.mozfiles.com/files/1039494/13726278479.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/segisugevulewibirewuja.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/pozijareduso.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/1/0437/8987/7405/files/first_alert_smoke_and_co_alarm_pc910_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7380/0858/files/juxizedixewuxejevaxe.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_off00005be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE2 5448 bytes
SHA-256: 4ab16c57bb46a05b35f103f36fb1b6c19d962e51399e07404849f42c44494962
font_01_sfnt_off00006e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 10088 bytes
SHA-256: 996f8966191d85a09ffe38c35b15d1598062cffe1f935af9139da3db2433ccf7

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