Malicious PDF — malware analysis report

Static analysis result for SHA-256 637668662b3e191b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-10 06:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98d40cca9a882655f3596e2a4efa39c SHA-1: 01201f8bdc36ec0dce21e3087f2ef4dff48bd889 SHA-256: 637668662b3e191b111459059fa3ab17a5963b958d617faa6b44ecbb9079e12c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'adjusted cash book format'. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

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=adjusted+cash+book+format+pdf
    • http://files.coloradowheatens.com/uploads/1/3/2/6/132681916/vasalapu-panipoxijato-rofuposotufule-retewaneko.pdf
    • http://sewiz.jillstarlingnovels.com/uploads/1/3/1/0/131070872/c453670faa.pdf
    • http://files.ohkanpai.com/uploads/1/3/2/6/132681880/f4213fc.pdf
    • http://duluvowef.michelleswafford.com/uploads/1/3/0/8/130814328/zabowuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/gisopoguvida.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/likixitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/sajado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/kisobatezafiwolup.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/60041512509.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/wizimodakas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/lubogujov.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/3247393632.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/cookie_clicker_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bujiwitedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9726/8128/files/logub.pdf
    • https://cdn.shopify.com/s/files/1/0428/6503/3383/files/ravan.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_off00007693.bin
aaffb306ded570e83dfeec1d698a0270cc62e7506a38eec18ab07283fd83fb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7693 5632 bytes
font_01_sfnt_off00008995.bin
3cefb8da38f5bce6402b84cd448c44834396d279c5f01c0b5b118024027847d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8995 10776 bytes

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