Malicious PDF — malware analysis report

Static analysis result for SHA-256 710bb13d1c27576d…

MALICIOUS

PDF

65.2 KB Created: 2020-12-27 12:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8dff28f74ad1667d8e47296c94a91d7f SHA-1: b9c55a39ed4e008a4f9edf9d8338a9530cfdd8a3 SHA-256: 710bb13d1c27576d698908f68829ca78a9b755b586c901094d50faed13841a64
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure and link farms. The primary malicious link identified, https://cctraff.ru/aws?utm_term=gucci+platform+shoes+black, is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=gucci+platform+shoes+black In PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fe1b25ea63c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9a76631075e.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/gijiTgi/28606972500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5fdc164552860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_5fb48a4924fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_5f996d13e08d3.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/ZheggQB/recharge_your_metro_card_paytm.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/b63cf66878cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8ab9bd71da2.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/afe3df1f-54fe-48b1-b93a-a734dd7f9b44/52613564466.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/4366141045.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_off0000becc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECC 5488 bytes
SHA-256: 8348356a9f707082795f909a448465a93571f0f2ea506d416f8a518f27468b74
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 11248 bytes
SHA-256: 819c50b39076c407527803f18cd24b2e939df81bdaf6fd27596265de2e872100

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