Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126d275c866724d…

MALICIOUS

PDF

77.8 KB Created: 2020-07-16 02:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b604c56ddb05b8380c98348d0862ab SHA-1: 8deaa3e547b308c933bd53a69bde3f12ded88498 SHA-256: 8126d275c866724d680488e3e74a4f7f4a5358da966519e8648f566eebcc6ba3
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to educational content ('Newton's second law problem solving worksheet'), which is a common tactic for phishing or malware delivery.

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/wb?keyword=newton
    • http://files.pemun.org/uploads/1/3/1/3/131384081/3121893.pdf
    • http://files.genotac.com/uploads/1/3/1/3/131398479/naxunusu-jalemin.pdf
    • http://files.piecesearlylearning.com/uploads/1/3/1/6/131636960/579402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://volutabeni.files.wordpress.com/2020/06/xubogulolaxefamokavuduwed.pdf
    • https://nonapuza.files.wordpress.com/2020/06/gutevupirejimefam.pdf
    • https://jizerorozuwo.files.wordpress.com/2020/06/72378930778.pdf
    • https://dopiximodo.files.wordpress.com/2020/07/57761774907.pdf
    • https://napusubet.files.wordpress.com/2020/07/49462047215.pdf
    • https://vugibuvasir.files.wordpress.com/2020/07/30917348389.pdf
    • https://lawikisuj.files.wordpress.com/2020/07/ruvof.pdf
    • https://sunoripe23167673.files.wordpress.com/2020/07/moviridesalurumuxozimavax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/94560353193.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/sujiresagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/tafumegajivedalinutok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/sunelikuloderozovesam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/15746403072.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/18535370940.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_off0000ea1c.bin
f9505cdf0c838ffdd6215307259d15a1028eaa340c05be5fedd00ad3806b8a17
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 5632 bytes
font_01_sfnt_off0000fd38.bin
319fdb7df141f26fd86e39b1062a842c24aae7b83ed26511472f25e928c6339f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 13896 bytes