Malicious PDF — malware analysis report

Static analysis result for SHA-256 b446730339f714be…

MALICIOUS

PDF

78.8 KB Created: 2020-12-28 11:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 684bafd185e72e290f2315c4722c31c0 SHA-1: 7728f69185c16e115d59e755834afe596a6f2e05 SHA-256: b446730339f714be93dcda5e839d0bb6f576af2ed53068d3932c709d76ce5421
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on S3 buckets and Weebly. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?utm_term=mewelde+moore+love+boat'. This suggests a phishing or scam campaign aiming to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=mewelde+moore+love+boat
    • https://zivopelorikeder.weebly.com/uploads/1/3/4/6/134677217/kejubixojobor_nenup_welefekuvini.pdf
    • https://zipegudedore.weebly.com/uploads/1/3/1/6/131636753/cfeb40d86dee5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/tolop.pdf
    • https://s3.amazonaws.com/divikufifir/colligative_properties_worksheet.pdf
    • https://s3.amazonaws.com/vipinib/how_to_find_someone_on_tinder_without_the_app.pdf
    • https://s3.amazonaws.com/dinigugaxej/58228841725.pdf
    • https://s3.amazonaws.com/jenisozazewubo/solving_equations_with_brackets.pdf
    • https://s3.amazonaws.com/faluzotixupi/concrete_riddle_answer.pdf
    • https://s3.amazonaws.com/temujonuwu/av_tecnologia_da_informao_e_comunicao_estacio.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d7.bin
e441bec2a1dbc70235650a6566d763cd6194d8b9f31dd696892e00f87f904011
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 5092 bytes
font_01_sfnt_off00010a2b.bin
0cdd6f1f868cb2ebe5ab3907ef61bbeaef9779bedc522a52cadc5a1246b83d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 10668 bytes