Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cd578ccd0a9540…

MALICIOUS

PDF

70.4 KB Created: 2020-11-23 08:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa79190e3a14e3b4e7ab157c88ca968 SHA-1: d552849f1ffe20cc445c4f27bb518609f37fc541 SHA-256: 71cd578ccd0a95402f696137a4f1c1530d76b40f313ba1a30d3ecdee577a84a5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=blockbuster+video+game+championship+wiki
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8c13450c0bb.pdf
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5faf50be178e2.pdf
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/vokofonixulawojiw.pdf
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8a4b8beb60a.pdf
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f8f674168727.pdf
    • https://wukonoru.weebly.com/uploads/1/3/4/4/134441013/kovaken.pdf
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fa5e007ad545.pdf
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f9ddfd171371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wanasuvedigo/99428890186.pdf
    • https://s3.amazonaws.com/zakunafu/niraparejubakotifudugufo.pdf
    • https://s3.amazonaws.com/ditiruz/xuwizere.pdf
    • https://s3.amazonaws.com/babetafaperaxov/jakaxubabetenava.pdf
    • https://s3.amazonaws.com/rerinago/27525614960.pdf
    • https://s3.amazonaws.com/ratixifo/firmware_development_tutorial.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_off0000d47c.bin
1ecb0e27c9754d83fa4cb5fdf05e87938fdabdee321e1c61dbc91cb20c53f020
pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 5892 bytes
font_01_sfnt_off0000e872.bin
2f586098dfeb4c66ce6a9b45b51c00f0846c63a57be415a0942d49d9d47c7e22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10560 bytes