Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc04aca4e18f0b0…

MALICIOUS

PDF

68.9 KB Created: 2020-12-23 03:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b855fb8056d740e28f74202e0b9d03c9 SHA-1: 50119fdd44f018d058a19f891ffc1610c819cd22 SHA-256: bcc04aca4e18f0b03be80271747447430f0e847c88df3dca8864fbe2db2c1b25
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'traffmen.ru'. This heuristic, combined with a high ML classifier score and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs indicates an intent to lure the user to external, potentially malicious, content.

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://traffmen.ru/strik?utm_term=2nd+grade+opinion+writing+lesson+plan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8c56dcaeda1.pdfIn PDF document text
    • https://jategolotigani.weebly.com/uploads/1/3/4/8/134882723/sibemisuvaxes-jajojusese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fbc0f5bc0b40.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/jixis_lawer_ranurekinagu_bozamogekigamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9a3adeeec61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe223a145a8629dc79bbc2/1606296123310/engineering_communication_knisely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8c8290-3be6-4831-963d-0352af54a9d7/80905288218.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d4086b97992eb55bb7f9/t/5fc12158fa04221c7148309d/1606492508154/48863508564.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d0c6791da6493f6663f7/t/5fc8432ce21c7c679add9b9b/1606959917959/20270101795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf029ac-a19e-4296-bc99-a72cc23d298d/social_work_documentation_a_guide_to_strengthening_your_case_recording.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a6c5e8-452e-4a8b-909a-521d7be54452/dodopazadodagukolosomoxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c6ad4c-4dbe-4541-9583-a584e1cfd0b2/61645733243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717a0861-c0b0-4eeb-ac38-465a2298cd04/sullivan_missouri_accident_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27b5945-ff71-4600-bba2-c19b431adb6e/20931461240.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_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 5256 bytes
SHA-256: 3f1755525e9457f7165bc4cac9aee8af805149d5e58c2009e246a75e3e7cafe0
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10312 bytes
SHA-256: adaf0222c4a5dfc76f5d6555dd7174d8738141f0624e162817c2b8d214b5d30d

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