Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc538b01b506537a…

MALICIOUS

PDF

70.4 KB Created: 2020-12-10 22:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ba1a0f8e2d861dcc13021033ec13df0b SHA-1: 19ab6151535cb8d4c5d1214856cf6fc69db084cb SHA-256: cc538b01b506537a8914d99d737561ac856038cc3dde78390ca2d09bab35bd81
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL `https://cctraff.ru/aws?utm_term=antibiotics+copd+exacerbation+guidelines` is the primary indicator of malicious intent. While the document body is heavily obfuscated, the presence of a malicious redirector strongly suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/aws?utm_term=antibiotics+copd+exacerbation+guidelines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_5fb2c82a652d8.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/palilo.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/melubura-rufil-bisofuwexowolek-fofukezujaxu.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/8203133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5f93309515b9c.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/f45d37e3-33ba-4b00-b2ba-4c748e8640f9/47332329414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc73d268-fd76-4dce-adb8-419b8ad4d5f9/hayabusa_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/speed_blur_background_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66c646b97992eb5814648/t/5fcf810afaf0bc04d1ceaa90/1607434508379/qr_code_scanner_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad6f611-40af-405a-b7e9-497781316250/zifulopa.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/71545016128.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/carrera_vulcan_e_spec_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/12559271375.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 5440 bytes
SHA-256: f978b4130c9ab00bb0914ea72bc26984b7b76a57fd94596dbfa4c8741f929c5a
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10836 bytes
SHA-256: d8a56e8fd0ad092ab07057d2e575aa7f4a2c3459ae219866c23686f34c3951d6

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