Malicious PDF — malware analysis report

Static analysis result for SHA-256 667b5d35df453e7d…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 10:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2740aeb8d6214a711acedc7d422598 SHA-1: 5c40ff9693d1b386f790102c1411c7a29132a0ce SHA-256: 667b5d35df453e7d1724f2ebeff83e1d0232e1f017d62077ba6df1325351472f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of a phishing or malware distribution campaign. The document also hosts a large number of external PDF links, suggesting a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the presence of malicious links is sufficient evidence for a high confidence assessment.

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=badminton+facilities+and+equipment+pdf
    • http://files.lsloan.net/uploads/1/3/1/4/131455398/484cd97f112f.pdf
    • http://files.insideoutnh.com/uploads/1/3/0/9/130969791/vuxakunodonuvugakom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/fuxizetes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/59379652040.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/sevatawogor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/fluke_t5_600.pdf
    • https://cdn.shopify.com/s/files/1/0430/7366/7225/files/36458145714.pdf
    • https://cdn.shopify.com/s/files/1/0450/0927/2990/files/6th_grade_english_grammar_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/classroom_jobs_poster_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/bimora.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_off00005db2.bin
33e0affe7837efaed1971d2ab6474319fb4baa52ace25e89b470e98cad5a1515
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB2 5380 bytes
font_01_sfnt_off00006fef.bin
5d5ac4ae2ca1036eae92fe56db36373078669534384d8379c83621bc277c4789
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEF 10324 bytes