Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc52904ff7772b77…

MALICIOUS

PDF

68.4 KB Created: 2020-12-15 07:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: af77ead581c0893fb3b21ef3cc911ed0 SHA-1: b7c2cb211e2e15a1730ec966c86ccce6c0e252a5 SHA-256: fc52904ff7772b7742a54799e252d01d636b5603e1c0337f1887f424c2ec5f48
194 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://gettraff.ru/123?utm_term=alaska+club+east+phone+number'. This indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://gettraff.ru/123?utm_term=alaska+club+east+phone+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_5fbee1f293440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5fbc5c79cdd6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5f9ddb264417e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f9e4dceee250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f9896e98b09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fa01675ad693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fad133fafa8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fd81512d0241.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/5a642d8a-3516-4cab-8ae1-c1e68665c90a/rapigumumebewunidaziwapun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a5f05c-7dce-4247-bd5c-f57d1269ebcc/best_fallout_4_armor_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb5630f-6111-4320-acac-c168c42ff18e/animator_dv_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fa2b4c-7719-445a-bd91-30278a504ce6/words_to_describe_people_that_start_with_d.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 5368 bytes
SHA-256: dcd9be840198868d41da3db035802052a6500b305a37dac9f65d793e7866ceeb
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 9996 bytes
SHA-256: 1a625b1767f0a78d98905ad64067812eb47d32c3120c4f7779c477dc928ec256