Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a81e663fe6c6c3…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 15:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ea25f9d06daaa857b4f1bc9d63e457 SHA-1: 1b186e7f8daab6794235a33caaa9da9a793234f6 SHA-256: 81a81e663fe6c6c3418328ebd2f57d6dfad247bdf24e3b96eb70c03c8332e11b
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 pointing to 'ttraff.ru'. The document body also contains the same URL, suggesting a lure for users to download software. While many Shopify links are present, one is identified as a redirector.

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.ru/wix?keyword=free+download+portable+adobe+illustrator+cs3+full+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/7855/7352/files/m_e_officer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/associates_of_arts_degree_sheet_csn.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/73527339511.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/75724937492.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/tifarukol.pdf
    • https://cdn.shopify.com/s/files/1/0439/7616/3486/files/pimokegopozilalisitotezo.pdf
    • https://cdn.shopify.com/s/files/1/0447/8880/9879/files/talking_as_fast_as_i_can_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2228/4960/files/trucos_busqueda_google.pdf
    • https://cdn.shopify.com/s/files/1/0452/0571/7141/files/bozebiwevejin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/32618547852.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/kanep.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/20367987374.pdf
    • https://cdn.shopify.com/s/files/1/0433/5242/4598/files/11059909842.pdf
    • https://cdn.shopify.com/s/files/1/0438/2556/1757/files/64784821503.pdf
    • https://cdn.shopify.com/s/files/1/0439/4106/8958/files/zafawuvifodapuwufugonaris.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_off000062ff.bin
548a4bea676c08cb04e80b38b584078a5cfe70cb46981343cd4fbaf15d465412
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FF 5560 bytes
font_01_sfnt_off0000760b.bin
739b994d3ee869e758dfd20ecf1c1ae338798bdc05c9222b1d0dd2e094e6c98e
pdf-font-stream PDF embedded font (sfnt) at offset 0x760B 10124 bytes