Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff228e5e31ff351…

MALICIOUS

PDF

48.6 KB Created: 2020-08-20 00:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ba3644fca01e5f4a777c2df32e56412 SHA-1: f8a83ea54fe5ef4262f650d5933bb58fb9a17819 SHA-256: 6ff228e5e31ff351a82f4239de7ab12a669f4d4cfc552309cc8cb136de62503c
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=sqlite+android+studio+application, which is a known malicious redirector. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious 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.cc/pify?keyword=sqlite+android+studio+application
    • http://files.robfenn.com/uploads/1/3/1/3/131398380/julabopixejo-wofevon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/reket.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6645/files/28607624319.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/32863578068.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/80826423968.pdf
    • https://cdn.shopify.com/s/files/1/0446/8968/6681/files/alopecia_areata_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/ignou_assignment_front_page_format_doc.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/bill_check_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/zuwejajonojebujovedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1195/5098/files/jitujad.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_off000072a2.bin
aa5e94569c630281bc7d89709ebaf210233fba25042d55940f50ec3942c8b336
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 5296 bytes
font_01_sfnt_off000084a4.bin
dd1e0aec2c4294cb65b0683afb27d9b728927a552b90cc2b68544695d0a40ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 16052 bytes