Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf81806da67f577…

MALICIOUS

PDF

55.6 KB Created: 2020-10-01 15:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d24af3d4edf5d43be9aebef2c3c1409 SHA-1: ebeb0def47b9b39c35b272593a7b67c13bf2c994 SHA-256: 5cf81806da67f5772adf22b055ede1ed9160722ddae0fd8f75098c41b9ff1c39
124 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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'basketball workouts'. The PDF also functions as a link farm hosted on disposable domains, further supporting malicious intent. No scripts were extracted, but the embedded links are the primary vector for directing users to malicious sites.

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 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=speed+and+agility+workouts+for+basketball+pdf In PDF document text
    • http://dofuwo.losangelestoyandminiaussies.com/uploads/1/3/0/7/130739284/9223137.pdfIn PDF document text
    • http://files.mikecaceres.com/uploads/1/3/0/7/130739144/7719675.pdfIn PDF document text
    • http://files.coloniachapel.com/uploads/1/3/1/4/131437711/bugavajega_vegojurimejiso.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/17421685035.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/59181397686.pdfIn PDF document text
    • https://site-1038351.mozfiles.com/files/1038351/zufitiwiwarisu.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/54117608030.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/94f3a96b-ca39-4b41-a359-276ab3e46150/bizolafixopesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/wisotujaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/9423/5294/files/herfindahl-hirschman_index_calculation_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/cuyahoga_county_probate_court_death_records.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_off00009b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7E 5712 bytes
SHA-256: 3e7834cf4e7782ef5102fa0089abe60e0fa0dbeec80f9d23843965f80c11a0d7
font_01_sfnt_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 10232 bytes
SHA-256: 4f4b2749b6b324e7d3b1039c599488cc0048cd39a8813bcbfc5504f75cf3cce4

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