Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2fa2a2926cd79a…

MALICIOUS

PDF

78.0 KB Created: 2020-10-13 19:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1946c9e51c79529ee4108ff40cd8db05 SHA-1: 8a0e30e781bf57a70bab4faf4933d8209e2375eb SHA-256: af2fa2a2926cd79a52986d34c5a0b6c83d72a5346ec3cb13e61ab116f34a30e9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=instruction+of+amenemope+and+proverbs'. Additionally, it exhibits characteristics of a PDF link farm, hosting numerous external PDF links, many of which point to suspicious mozfiles.com domains. The ML classifier also strongly flagged this PDF as malicious.

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=instruction+of+amenemope+and+proverbs In PDF document text
    • https://site-1043958.mozfiles.com/files/1043958/kuverilor.pdfIn PDF document text
    • https://site-1038904.mozfiles.com/files/1038904/24105179574.pdfIn PDF document text
    • https://site-1038684.mozfiles.com/files/1038684/gusunuto.pdfIn PDF document text
    • https://site-1043477.mozfiles.com/files/1043477/40779160055.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/tewovanapesamifozabujiv.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9653445.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.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/1/0491/8339/1910/files/chess_puzzles_mate_in_two.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6286/8633/files/make_it_stick_full_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7934/3527/files/anime_image_board.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2249/4107/files/20607286282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/nature_play_areas_perth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7482/5621/files/38551342106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8181/7494/files/devifabedowozisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0423/8234/files/cal_poly_alumni_directory.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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 5408 bytes
SHA-256: a9ef8f39d868d132884457048071de7fe686d68106b565db5066ca8509b858e1
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 10436 bytes
SHA-256: 0de8cf5e22161cab51b17df3fa9dd9e2b0d3d633eed865c25dc4944f62560366

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