Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a573203b38f14a…

MALICIOUS

PDF

33.7 KB Created: 2020-08-22 18:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5bffcd168921a28006b733c2c908dd5 SHA-1: 36f23ab55806c01ec5b9a504d0b30116c7349269 SHA-256: 92a573203b38f14a1e77a60795425de30860ec719cbacb6925ae6fb0e6aba151
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=ghostbusters+song+piano+sheet', is designed to redirect users to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=ghostbusters+song+piano+sheet
    • http://files.webuyjunkcarstrucksvansingeorgia.com/uploads/1/3/1/4/131453465/f10b9.pdf
    • https://cdn.shopify.com/s/files/1/0435/2373/5720/files/46907358743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/romijifajutezosebi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/bowosutatabemifatujeniw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/tonto_de_capirote.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/tsunami_2004_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/marginal_distribution_joint.pdf
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/22848143186.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/9799792148.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/xizazakakugejidozokor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/kikosamikirij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/44916448633.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/ministry_of_finance_egypt_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58657968950.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047bd.bin
773b3273e81d8cc40923511fc92ce58cbc1deec3e8f081507b38041442e360f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x47BD 5220 bytes
font_01_sfnt_off00005971.bin
1d68634e011b9920bc9c01003370c844cbfa626f52a8efa298733043cff3acd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5971 9532 bytes