Malicious PDF — malware analysis report

Static analysis result for SHA-256 af643ec57120d35a…

MALICIOUS

PDF

46.7 KB Created: 2020-11-03 01:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c361618f778f7bd9d80aee0032add2e8 SHA-1: d9df7edf8f223622d8c0ba7b7e8774abc902a0cb SHA-256: af643ec57120d35a8bf33a04ccfc0ac2c043f40f9d6b65a790d85a9dea5d3c25
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/strik?keyword=definition+of+a+jump+discontinuity In PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/6885679.pdfIn PDF document text
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/5302396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisute/wifalavofog.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/la_zanahoria_engordan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f40b944-559f-4d4a-bc4e-d87cd753a90a/66006920818.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/calculate_the_perimeter_of_a_triangle_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2e8371-a461-4bb1-a1a2-c05cc50f5458/rocksmith_2014_xbox_one_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/brother_printer_not_printing_correctly.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/ap_stylebook_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/scp_medical_department_ranks_and_jobs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5333 5232 bytes
SHA-256: e7870a359c8ebd31ce96e84c46c9d6adbcb3512003c8ccc46694939a1ccbbfd1
font_01_sfnt_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 11336 bytes
SHA-256: 55d36cca0c7ac0117087b3ec82f22151b993098eaaafacd149718c024f34a619
font_02_sfnt_off00008b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B52 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940
font_03_sfnt_off00009fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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