Malicious PDF — malware analysis report

Static analysis result for SHA-256 875a1a2feb6d68b2…

MALICIOUS

PDF

44.4 KB Created: 2020-10-30 14:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 092ce05b0354301c4618ccff48a2686e SHA-1: 27ab813bf10100199c5ee589384b7f3d8aef5e72 SHA-256: 875a1a2feb6d68b2963385e83bb051fe221c6f1ff198f608562caa38d179e788
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/123?keyword=lake+highlands+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f99113da2f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f895f0865e7b.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/kurexuvapukoni-tiworinojemezi.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/69d5f7f2-aa02-4e73-b096-fed3e03526f3/vijatosowajewagavegev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0506cf03-0383-40f7-b333-5d19292a0bae/rakem.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wopifamijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df90b4e-b424-40b9-afc3-1b06d658ccb8/76600515087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494390f3-8bc8-4d7e-aced-03a1258c67ec/nobivadoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f74abd-03c3-4e1b-897d-ee74f083ba2e/1725752441.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/19155542606.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_off00006b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 5112 bytes
SHA-256: c115c6d0632d1239fd8a9e1285369cfad265827571e867b7ebedc8fd84309ffe
font_01_sfnt_off00007cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFF 11956 bytes
SHA-256: 60fb53ea228b6366d48a38d214ad976bbab5495fcf47c09f5454a12bea1b399d

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