Malicious PDF — malware analysis report

Static analysis result for SHA-256 6438a8c96db94274…

MALICIOUS

PDF

67.7 KB Created: 2020-11-24 05:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9855b4ef671d7997f5ee259227fae407 SHA-1: ee1cce6425bbe177fc125b1dbbdbd06c558adf51 SHA-256: 6438a8c96db94274a602a4d6b6976f99121ee9dd17f232709105087dade67555
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it's a malicious redirector and part of a link farm, designed to lead users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs, particularly the one pointing to 'traffking.ru', are flagged as malicious redirectors, suggesting an attempt to phish or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/aws?utm_term=altar+of+siena+b1f+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fa48eb7ef702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9c24a2f2408.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/8626484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f9982fb2da92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f88dde973067.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/191b57a0-08f6-472f-b11d-78b2d44cea7f/18678843641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c78fd1-ff3e-4d22-adca-6b49d0a361ac/the_lion_king_2_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa67d753-1154-4655-b176-dfa0626b0f47/90053438565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50558bcc-e40b-4daa-bc09-e8365da94aa0/lahey_behavioral_health_colleague_connection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a55c5f7-adc2-4fb1-89e4-e69b231e495c/sofafakomitawofidijoruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033d5626-092d-451e-bc72-84ffc5fff1c1/weed_blow_torch_lowes.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 5256 bytes
SHA-256: ee0573b0fa1f5827ff59aeb938998bc0ace4889ecb69ae36b40560ff069c6829
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 10664 bytes
SHA-256: b3e8c92c956bd21ff3c849619d40e7873c31b48619ad4bd2db6e305e5df336d9

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