Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c465b3d8212f3…

MALICIOUS

PDF

54.2 KB Created: 2020-10-27 04:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08652e3043b8dbd9bc52e440b09079d6 SHA-1: 2c14c13323d9404e34808b60cf36e6a3195f0f29 SHA-256: 5f9c465b3d8212f3f8e828b276755bc554d4ba7c1adce15b5ffdf371d50e4b1c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text and a URL that appears to be a search query, suggesting an attempt to disguise malicious activity. The presence of numerous external links, including one to a known malicious redirector, indicates a likely attempt to lead users to harmful content or manipulate search results.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=schenectady+city+schools+human+resources In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f8b12cd10f26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f874c846ac75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f8a17b4cfd94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8975de75646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_5f96d33387f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f974705898d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f8a545ebf814.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/d37c6.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/nivejojarosilo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fexazuvogajokover.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/sowemibojev_nemavi_reguxumegen_towefek.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/5781805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5f92a5084f644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f9378949a555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f97763b6350b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8d057fc51d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f86f6c4a56e8.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/6ea25ea0-2778-4323-83b5-fe5618d5d1d7/92196752730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c2630e-b5fb-40cf-bbc7-01f6e5574db4/wijugirelekamazofefileral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddde06a3-bf62-4021-b2a1-e318e6c2b102/mots_tiquettes_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d075c54-a880-4c41-b9b5-345236683e8f/sebira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5478/7477/files/tukuteramofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2227/3688/files/lion_king_plushies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5412/0103/files/xopunufebufok.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_off000092b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B8 5384 bytes
SHA-256: 92f2219125074c8576ad9408fa058569d333c336db2cebbb3291220ef15122bd
font_01_sfnt_off0000a4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CB 10648 bytes
SHA-256: 0ce657a78582172387361f16b69769474505d35c088da894e50f5b42735db27e

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