Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38cda55b6e65c74…

MALICIOUS

PDF

43.5 KB Created: 2020-11-03 13:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b9ffadb9661ed3292ad7dee01b158357 SHA-1: b81471552e680aabda5e1d208f0959c6cc1a108c SHA-256: b38cda55b6e65c74094aae16b24616196dd3d9b132e56015809b472b9385e0f0
134 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, specifically `https://cctraff.ru/strik?keyword=lm+software+center`. This URL is flagged as a malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a reference to this URL, reinforcing its role in the attack. The ML classifier also strongly indicated maliciousness.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=lm+software+center In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f9574c2e4285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f90a4fb1c72e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5f9c2a9ef1070.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/33b6c972-ebd1-48bb-88f5-d6d2b1ffa3cf/87166241997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efecd619-d097-4c46-8607-1776cb2268ef/49909709501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f390165-7377-453e-b8fe-a4cb1ff54881/28322996047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfe7d0f-e7de-4003-b57d-3c8dffa04819/42391931065.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/soldier_of_fortune_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/78812881056.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/business_english_conversation_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/rfid_based_attendance_system_using_pic_microcontroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217f636c-3c6d-4b52-96ba-a36e2e842b70/98161051193.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_off00006d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D94 5028 bytes
SHA-256: 8dba47c006bbfd0da335d189445920511fc0c4718b992db486c80b4d31f0b6a8
font_01_sfnt_off00007eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAC 10136 bytes
SHA-256: 53bb176765d66404136e60019a8b3d1514fe820283f0c8cabc86383443991eb3