Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d4ca5b7d2e2449…

MALICIOUS

PDF

124.9 KB Created: 2020-12-23 05:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 145d9cef9de325a4199c00106c3fea38 SHA-1: 9f536e49fe09c59764b18c47cb77bd606e6ba15b SHA-256: 92d4ca5b7d2e2449a37c512567d06dfff925390035b1b705ad9c34062e8e6613
254 Risk Score

Malware Insights

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

This PDF file contains multiple links to redirector infrastructure, specifically pointing to 'cctraff.ru'. The heuristic firings indicate it's a malicious redirector and part of a link farm, suggesting an attempt to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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?utm_term=vintage+afx+slot+car+sets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_5fa60a29ce76b.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/3313580985f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_5fa265ca20de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f9797835266e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5e410af5-039a-42b7-8352-3b81bb2acaae/robaxiropilatevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2eb6dd6-9d5a-4259-a761-2547c8dc1a93/6051604169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce50fa5-225c-4dae-a1a3-45fbc88f09a4/zumopedinuwefamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57bbba70-e09e-41ab-a70d-22e3322d0d59/76888877865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9c6c48-748d-4e55-9774-248a4b9cfd40/24772307224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a219af5d-902d-4121-8af2-cac5e7860004/amazon_music_show_download_queue.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/10424446161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b95d0d-6b10-4f7b-ab09-81913c9bdff9/dayton_3z918_drill_press_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A031 4872 bytes
SHA-256: e97414e30f024f3a3ef283bfdec0aa0b2f05520f03053c6da5b3fedcbca84a8a
font_01_sfnt_off0001b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0D1 12176 bytes
SHA-256: 037b095914233040745e480ba7fb280b1f557dfc90e84d28e6f0910bfcfc1373
font_02_sfnt_off0001d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D833 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f