Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdec75a1b9edad2c…

MALICIOUS

PDF

57.0 KB Created: 2020-12-21 20:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ff142b4fc9ce40d31f0eb466a2a25036 SHA-1: c105448195aa081527f894895898565543e6d2a0 SHA-256: bdec75a1b9edad2ce679c5c3fe8e0532acf9d95f31de368319d8d2875903716f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/123?utm_term=harbor+freight+-+centech+cable+tracker+%2528item%252394181%2529'. This indicates the document's primary purpose is to lure the user to this malicious URL. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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.
  • 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=harbor+freight+-+centech+cable+tracker+%2528item%252394181%2529 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5f9e30b6b9054.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/5fc14b808139af037647f366/t/5fd2132aef89ac66837d45f8/1607602987287/oxygen_saturation_covid_symptoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2334674-ded3-486f-98bf-ef1f18573e6e/best_free_karaoke_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2214a0b0-fe3b-4bc2-8d66-93b48f3ca73b/44416695462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77996050-a9df-4ca0-86fa-d8788071d27c/33175422567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4528c98-659b-41b1-8b64-baa7a4159df3/zezazipozodugumaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39fe91b-2db0-463c-b1fa-4a65cc868730/zixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0139fe-bee1-4f33-bac5-75b42777bba1/lego_city_fire_station_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89abd126-332c-4140-a38c-ad563a65dcce/franconia_springfield_metro_to_pentagon.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_off0000a574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA574 5392 bytes
SHA-256: f3aa51fcdb79f3c704d1a24ac43eb973b981721d8bfed9d81c66186b58adefbe
font_01_sfnt_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 9236 bytes
SHA-256: 6d1e40ff21bdf3a6eecd9b807c5a2267b037efd5a30e4a3400149de01fbe9d0f

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