Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52a6fcbc6627443…

MALICIOUS

PDF

75.8 KB Created: 2021-01-01 21:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e760803330ffb34db71d5b358786d71b SHA-1: ce8e01337efc50edb4e68da598ab68ae8a4e2c1b SHA-256: a52a6fcbc6627443d5a70ff8f1024224aaae870cb649c48b2995b521ca0044bb
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, forming a link farm, with a critical heuristic identifying it as a malicious redirector. The primary URL, https://cctraff.ru/wb?keyword=name%20photo%20song%20on%20birthday%20cake, is a clear indicator of malicious intent, likely to lead users to phishing or malware distribution sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wb?keyword=name%20photo%20song%20on%20birthday%20cake In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fbc178187fde.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/xupimud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fa92db70413a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5fb3410676451.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/nijixuxoravi.pdfIn PDF document text
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/wevitenakaraloxi.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/gonepoziromeb_buwitifumuke_ranekim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_5fbd810fd9cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8e3e370a516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fbd5b2f02b82.pdfIn PDF document text
    • https://ditowesoxuro.weebly.com/uploads/1/3/4/8/134885058/657948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5fc73cf557fe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5732 bytes
SHA-256: 1e0698268aaaa9f5c882d60a511e90227914de1d7d19b73278c666a5093cd657
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 10820 bytes
SHA-256: 8fa325d427e7c74a4cf192ba82e7aa44d44080a3a809ee064a2671e60cbb7502

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