Malicious PDF — malware analysis report

Static analysis result for SHA-256 1834b1fc6b94c94c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 23:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 620b7b32eaa51a9b19e29abad36abe1d SHA-1: 6896e41a7b0aee21d643012a755452f4ef075e1d SHA-256: 1834b1fc6b94c94c99ea0e14f795e400a368960d90866d6887c68d68d5469167
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Kjv bible app for android' and the malicious URL, suggesting a lure for users interested in such applications. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=kjv+bible+app+for+android
    • http://files.coutellerie-le-cellois.com/uploads/1/3/1/4/131437295/b660a.pdf
    • http://files.pjeterkoleci.com/uploads/1/3/2/6/132681938/f414f68e3faf.pdf
    • http://kekibu.threesisterstudio.com/uploads/1/3/2/8/132814930/litaximosumir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/yoshiko_kawashima.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/44028758208.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/free_brush_lettering_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/balance_sheet_reconciliation_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/39809419958.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/wezeluwojigisaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/71086808781.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/48874837725.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_off00006446.bin
02c4efb71c66b50dc1f6a1b1b49228dabed9412d5a1fd2e78f2dbd7cadfeb611
pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 5100 bytes
font_01_sfnt_off000075b7.bin
58aad2d272a0e91cf6dd23ce46e304aec731694d74e212bb4693fb5c07238013
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B7 9932 bytes