Malicious PDF — malware analysis report

Static analysis result for SHA-256 6585f69cfd1eb5a4…

MALICIOUS

PDF

37.7 KB Created: 2020-08-26 21:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8478dcc47821c1866f19d418c578a9e SHA-1: f3bd917ccbe73f320442bf3fc91addaa2d7c42b8 SHA-256: 6585f69cfd1eb5a44b40cc37cc0ca279741191934cadc2b996f68ae1cbf0026d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to redirect users to malicious content. The presence of numerous external PDF links suggests a SEO-based link farm tactic, likely to improve search engine ranking for malicious sites.

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/pify?keyword=developmental+mathematics+2nd+edition+franklin+wright
    • http://files.orthodoxservantleaders.com/uploads/1/3/1/4/131407552/redibafemejuxi_vudovirabax.pdf
    • http://files.maintenancemanusa.com/uploads/1/3/2/3/132303230/denelude.pdf
    • http://files.joelhgarciaphotography.com/uploads/1/3/1/3/131381288/3875121.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/live_football_tv_streaming_hd_app.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/50267005244.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/anthropological_definition_of_religion.pdf
    • https://cdn.shopify.com/s/files/1/0429/5232/7324/files/define_search_engine.pdf
    • https://cdn.shopify.com/s/files/1/0428/3275/6902/files/65256532413.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/55292446344.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/favozapor.pdf
    • https://cdn.shopify.com/s/files/1/0449/8613/8792/files/alternative_investments_caia_level_i_wiley_finance.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/tuduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.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_off000053cf.bin
cb63d8aa905e91edbcfd5876bd1acceb671f273868bb45cd7871a896271a8b25
pdf-font-stream PDF embedded font (sfnt) at offset 0x53CF 5916 bytes
font_01_sfnt_off000067e2.bin
5e38c8a216e622fd65e8816ee29dcd19da86e76766b24a44716d699562719e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 9876 bytes