Malicious PDF — malware analysis report

Static analysis result for SHA-256 4660160a141729a4…

MALICIOUS

PDF

41.1 KB Created: 2020-10-31 11:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b7f82083bbe79ac0af2084689ddaf933 SHA-1: 8b4ca42a55f43a1772de59a048f47f77d5fb87e1 SHA-256: 4660160a141729a40d4a3a53d502cff4dba789122a4002dca073f545300307e6
194 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 embedded links that redirect to known malicious infrastructure, specifically advertising a 'drivers ed drive right book'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of embedded URLs and the redirection to a link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ttraff.link/123?keyword=drivers+ed+drive+right+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5f9b5d91b3b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f8789634185b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5f8b5899e13b2.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/f248a0ef-6c91-4fee-9d82-f1db4ce72ac3/63500536762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aef352-8030-4e73-8e78-3160eabc27d1/vodamubenaxuxafetom.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/tinkle_digest_blogspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a101b051-13ab-4ee4-a3f5-aae41a0b02cc/bovat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd8835b-46f4-4bd1-b268-bdd32e42afc5/92995094460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4711/6191/files/tesug.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/pidutezupegez.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_off0000621f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621F 5108 bytes
SHA-256: 99112caf8327c9054c2fd3eb7d6cc70700f2dfa08d550b9f9b994235bad1a0a9
font_01_sfnt_off00007383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7383 10628 bytes
SHA-256: e4fdd2d25326264773998476966e42c9598f6933ecea7662d56a592c48159f69

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