Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db1d386bcd33743…

MALICIOUS

PDF

34.6 KB Created: 2020-08-26 09:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 21c8bbdc20cc73aa63cc9383febe25bb SHA-1: 234159b999a5256adfe78efab03a8b9236e03b4e SHA-256: 9db1d386bcd33743342fed89af02d77da0e9e8410fdcf3f05221c3a3be38776c
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with keywords related to adult content, likely to entice clicks. It also hosts a large number of links to other PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious intent.

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.cc/pify?keyword=mofos+free+porn+videos In PDF document text
    • http://files.nanooknutrition.com/uploads/1/3/1/4/131437139/227512.pdfIn PDF document text
    • http://kodafoful.elportalschoolptg.com/uploads/1/3/1/6/131606666/3302135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/animal_diseases_and_treatment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/sukusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/affiliate_marketing_for_beginners_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/all_the_beautiful_lies_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0336/1698/files/vikejewekesexomososobuxuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/35400923001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/yellow_belts_karate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/46192747278.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_off00004ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB1 4860 bytes
SHA-256: 8ecec33707adfdee001ec261602fb5aafa730522504b709598084d315e94fcd2
font_01_sfnt_off00005b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B59 10196 bytes
SHA-256: b6cc59b221bafa8f7a57bccc19ce80317fdeef4515bca63fc5694d69414c46ec