Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd4aaba9e3a7280…

MALICIOUS

PDF

73.3 KB Created: 2021-01-28 14:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf49ea2ecda39b5f640436afabcba54f SHA-1: e428dc75deb8cbee53dc1f3455923dd51575d5d2 SHA-256: 2bd4aaba9e3a7280b03cea6b218289e1eb3be857ab19334a147ba6d40404a1b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors and link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to redirect the user to malicious content, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=yandex%20browser%20alpha%20apk%20old%20version In PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/polumezo-potilexamob.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/4711575.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/bEtibjc/sifadetunoven.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/ghi3J1J/78981617728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5fcb17bd6f721.pdfIn PDF document text
    • http://violet-cinema.ru/yoob_games_100004kwys.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hjidr7l/diced_onion_calories.pdfIn PDF document text
    • http://pmaider.com/190099791910xow5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/woriradegilorenitiga.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/blf_a6_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bakibesurezowimum.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/best_organic_facial_mask_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/il_foreign_corporation_annual_report_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/synonyms_of_form_basis.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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 5432 bytes
SHA-256: f73d7e78064d312d49a8bfb4c365525d3e97b3361d85a6218457f048c8305666
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 11796 bytes
SHA-256: 33f499d5addc8dede3facf3666733e739af27a9256b8c450479606ca8ac1b724

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