Malicious PDF — malware analysis report

Static analysis result for SHA-256 6787d478952cd65a…

MALICIOUS

PDF

48.5 KB Created: 2020-09-07 14:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a473e649d0f778fd0e5c66afc15b12e SHA-1: 2e0b10a80aab8c672f7ab7d205f2c2f391faeaa9 SHA-256: 6787d478952cd65ab30974323adcffe0d1caefd193de57e42905ba244c5c074e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.club', which is also present in the document body. It also exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but likely used to inflate search engine rankings. The ML classifier strongly indicates maliciousness, suggesting the primary goal is to redirect users to malicious infrastructure.

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.club/wix?keyword=altimeter+gps+pro+app+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4b874d_53e5823769304cf190931658420823c9.pdf
    • https://static.usrfiles.com/ugd/defcb2_17d16f545d82422bb5b25209a942e6bd.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_5a743bac945c4d128fcd935c0d025b9b.pdf
    • https://static.usrfiles.com/ugd/cb5dea_2082e3582c654ea68cadadee2b52e17f.pdf
    • https://static.usrfiles.com/ugd/9f69bd_644fa316027e43fa93d6a5ecb09dcd26.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/zarolukesegudonabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3499/9975/files/dasowivononorawuwuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/vigumosetolekazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/23788923073.pdf
    • https://static.usrfiles.com/ugd/ac8c68_133429a4fe3d4b8fa46d2d5df4aebcec.pdf
    • https://static.usrfiles.com/ugd/eaf48f_53c5e494f3ba4d889572d1f63d413780.pdf
    • https://static.usrfiles.com/ugd/784815_31ecb4a315ea4dadbc934590f1611c60.pdf
    • https://static.usrfiles.com/ugd/9e53d4_c142f0d414b2442b8d322a5e73a21a53.pdf
    • https://static.usrfiles.com/ugd/c46c8a_c541a03ebf034ce28a788bc3b48f7e17.pdf
    • https://static.usrfiles.com/ugd/3ce946_7d088828b0ad43aebe97c45d6d051c0a.pdf
    • https://static.usrfiles.com/ugd/ae059d_9e98b26cf4e3493a9990e83ea9775afb.pdf
    • https://static.usrfiles.com/ugd/c79b1c_9f3716cc5224410fa67ad45014eecd8b.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_off000080b0.bin
27a120256ab4b4f4d2909b68f27c14ee90757532a4143e8125578fc75ef7e4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B0 5348 bytes
font_01_sfnt_off000092cc.bin
31faa0e09cd78268d77b1816d92a6b6890c8302f2531e0e1e4b6a36f70ed75b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CC 10024 bytes

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