Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24de41fbd537238…

MALICIOUS

PDF

71.7 KB Created: 2020-10-03 06:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c7c93c84973c3ce08d347e97f105710 SHA-1: e1ca276bd804662d59f3d98a92c143c206597047 SHA-256: f24de41fbd5372386b860ca839665376a52fb106b479da37ba0685ef394b775f
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The ML classifier also strongly indicated maliciousness.

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.me/pify?keyword=time+series+analysis+and+its+applications+solutions+pdf In PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/fesodojotekijipoxemidel.pdfIn PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/badas.pdfIn PDF document text
    • https://site-1040050.mozfiles.com/files/1040050/71392915868.pdfIn PDF document text
    • http://bavedavuz.christismysaviorministries.org/uploads/1/3/1/4/131410090/b249131b639c9b1.pdfIn PDF document text
    • http://godis.charlotteponyclub.com/uploads/1/3/2/6/132682883/dfd03840.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/1/0480/8042/1018/files/dorothea_benton_frank_books_in_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0606/6325/files/cthulhutech_character_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1309/7640/files/bozabatup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1979/6633/files/word_whizzle_answers_gazelle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/amoeba_sisters_dna_replication_answer_key.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 5352 bytes
SHA-256: ed053859cffe9368bf4db0ee041cac870e557dd3a3afe621cd7d28d0456e6a0a
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 10360 bytes
SHA-256: 6ca9a2681752065fcc1829b011b4b79295844675208743400d4221270578f6fc

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