Malicious PDF — malware analysis report

Static analysis result for SHA-256 61133e17e629fc7e…

MALICIOUS

PDF

54.0 KB Created: 2020-08-16 21:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b250cd1efc7c7f26b1a0fdfe89bdbf98 SHA-1: 159c351e37377cc46591d46f7b5dc37a04f595cc SHA-256: 61133e17e629fc7e80b99b6357ae0cc7271d974379314de47e18fb1caf12fadb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify-hosted PDFs.

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.com/pify?keyword=apnea+del+sue%25C3%25B1o+pdf+2017
    • http://files.mtjewelrybox.com/uploads/1/3/1/8/131857038/cd74baed7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/58604032887.pdf
    • https://cdn.shopify.com/s/files/1/0431/0823/7473/files/lukigonaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/24721147225.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/34958510931.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4097/files/38027499880.pdf
    • https://cdn.shopify.com/s/files/1/0439/3920/1192/files/boston_bruins_nesn_reporter.pdf
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/blouse_cutting_method_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/gazizonobuxiwozugemaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/sexikofitumonumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/8013628019.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/badshah_full_movie_720p_bluray.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9509/files/chicago_cell_block_tango_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008982.bin
8f5fab399fe5b587e46316b1e4abc5b576d4937238484eed4ada056aafdb34e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8982 5544 bytes
font_01_sfnt_off00009c3c.bin
5afc23b13b79e5d038fd493327eed8433cef59e09ab228747c04d7453cc82d18
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3C 14880 bytes