Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da729fbf17db778…

MALICIOUS

PDF

69.2 KB Created: 2020-10-03 08:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 843eace98d0c21ad899c76b67930d4dc SHA-1: 524c5a1dcdbc7c93882bcc9808fa8dd2b32c1f8a SHA-256: 1da729fbf17db778eb4f704f3f408dd7e375d4d23d63520c660d5f77f5ba37ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=gimnospermas+y+angiospermas+pdf'. The document body, though heavily obfuscated, contains references to the same URL, reinforcing its malicious intent. The presence of a large number of external links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=gimnospermas+y+angiospermas+pdf In PDF document text
    • https://site-1038556.mozfiles.com/files/1038556/22701034287.pdfIn PDF document text
    • http://ruvobe.rangebourne-pets.co.uk/uploads/1/3/1/4/131453960/4217390.pdfIn PDF document text
    • http://vaxepu.alchemyperfume.com/uploads/1/3/2/7/132740917/f88b194bc4bf38f.pdfIn PDF document text
    • http://files.callowayfootball.com/uploads/1/3/1/3/131378814/meloxebenejix.pdfIn PDF document text
    • https://site-1038788.mozfiles.com/files/1038788/xewunijoludo.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/20110108631.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/97271054124.pdfIn PDF document text
    • https://site-1038510.mozfiles.com/files/1038510/lefumenazoxosinevobabo.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/1/0499/8440/5654/files/zexitadiduxezidubatuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/book_dragon_ball_super_broly_tickets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/research_methods_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4691/8551/files/law_and_order_svu_logan_paul_scene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3368/0282/files/apk_ram_expander.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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 5460 bytes
SHA-256: f05e267d32497a4a31e15e80bcf53713d41048f1a4d35312efe186d003623a15
font_01_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 11984 bytes
SHA-256: 3037e819ee94664d21f5f630697dc8d4604cb0494050bb25d4b09625085fa4bd

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