Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4a7bb88cdb53f…

MALICIOUS

PDF

41.3 KB Created: 2020-10-27 20:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 823a237585c05a235adc1c54bbe32179 SHA-1: 96cb34af051da8395beec13e8ea1f17ed36c305a SHA-256: 7fc4a7bb88cdb53feef63caeb595d627cb614f34c879a7fb93f87b6db898d30a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, masquerading as scholarship information, with one prominent link redirecting to known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malware or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ttraff.link/123?keyword=5+major+components+of+a+computer In PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/1156579.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/3204337.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/valedakivoxi.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/a2a05d8d-6ebc-446c-9a86-439bbb03ff27/baylor_school_of_music_scholarships.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e020300-0bc1-4ce9-82ea-bfd87c571605/japatalabazazukaxutuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc37cf3-04fa-40ab-8eac-24828fed6f71/radiology_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc9e44d-b93a-4193-b16e-4c41daa6e306/59847267377.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/medicinal_uses_of_catharanthus_roseus.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/morosuxogij.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/cathflo_activase_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/walt_disney_world_park_maps_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57fc0bf-6a53-40f8-8b24-5a9f2a5826c5/98090121679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576e52a3-59de-46a9-960b-0d4194d86451/40579007773.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/1664864521.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/belanivaxurux.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/32009994028.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/11894783528.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/21816608522.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_off00006410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6410 5236 bytes
SHA-256: f94459769224b53894c55aca0fce0be21ff3020815b2a6f2c928fda0e1079b9f
font_01_sfnt_off000075c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C8 10024 bytes
SHA-256: 102da36c6ef921f646e7971e21fe7be188688b9eb4a30ab3bd56cc06e6080968

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