Malicious PDF — malware analysis report

Static analysis result for SHA-256 6900c8531dfda04d…

MALICIOUS

PDF

72.0 KB Created: 2020-12-28 08:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3761d962ac066f6aba847afe47adc97d SHA-1: e22d7af0f724476b88b263c4dd13f273a43dde70 SHA-256: 6900c8531dfda04df1136f1c657d73adee92e78ef9e66e12197ea18e1c4fc20e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to redirect users to harmful sites. While no scripts were extracted, the structure suggests it's designed to facilitate malicious redirection, potentially as part of a phishing campaign.

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.
  • 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://gettraff.ru/aws?utm_term=transfer+data+between+android+phones+via+usb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5fbec1bbd492a.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/jebajugikomeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fa1ebf7b9181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5f9c6f8a4d470.pdfIn PDF document text
    • https://rusopanuguxixat.weebly.com/uploads/1/3/4/6/134640346/dozikis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcf3f738bd3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f99295c1f698.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/gwhfPhi/adt_pulse_login_failure_unexpected_error.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fbc2d2e2b281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/probability_sample_space.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8e2414-df15-4211-b2ab-d69b4e3211ca/talilewozagomigeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8546f80b-9941-4e02-87fc-2f3376ef6671/granny_smith_apple_pie_filling.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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 5340 bytes
SHA-256: 6c4bc8a77829da53ee8a9f25150f1fdb36678abe23fa1e43ea59064ee6067b74
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 11380 bytes
SHA-256: 1f7f060e2a52206aacc0ada4463767272dd7f9142837d90b9486dcba7b0c789a

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