Malicious PDF — malware analysis report

Static analysis result for SHA-256 147aaf8c511257dd…

MALICIOUS

PDF

44.5 KB Created: 2020-08-19 11:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 454997d72966ca7f9dd2758b3259bb54 SHA-1: c4047c6e428c586beab13027e56764dac5ef9894 SHA-256: 147aaf8c511257ddb863d71b59d46fff8e6abdb4845487ce3a1efdea33eb7733
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve SEO for malicious content or to distribute payloads.

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=letter+of+resignation+template+teaching
    • http://xotef.anunexpectedartist.co.uk/uploads/1/3/0/8/130874631/5239539.pdf
    • http://fukanuj.hopegoodells-lcms.org/uploads/1/3/1/4/131405927/4782986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/gogujanizalivabutozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/59071854409.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/zuzilimunulubuwolenin.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/chronicles_of_darkness.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/67015944493.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/tegepowilobezef.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/29494716000.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/64524856300.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/pobamowaguwel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/24659173530.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/finajelisenogimazax.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_off0000702a.bin
cbdb3d82f8955c28ef89e4bed06c75143babb33b9e4de03f12d3ebfe6505e14a
pdf-font-stream PDF embedded font (sfnt) at offset 0x702A 5372 bytes
font_01_sfnt_off00008249.bin
9d75b1ff2588e230f62f020f4eabbcd11c455ebf15066996d107c2db0f15ec0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 10144 bytes