Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a40ee95fffb1cf…

MALICIOUS

PDF

40.6 KB Created: 2020-08-16 02:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4caf8fcf8d3dcbaa5a813373a78675 SHA-1: 4fe6ca485f7a4dd16bab50f59d6aae5947473f6e SHA-256: 26a40ee95fffb1cf696fb06a11fe12af2ca5c080e2cff362cf4695bb3524148d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.cc/wb?keyword=industrial%20safety%20and%20health%20management%20c%20ray%20asfahl%20pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking for malicious content. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attempt.

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/wb?keyword=industrial%20safety%20and%20health%20management%20c%20ray%20asfahl%20pdf
    • http://files.villaabadi.com/uploads/1/3/1/3/131379049/fe8f91cb7c36.pdf
    • http://files.limeandstoves.com/uploads/1/3/2/7/132740449/pajurubevi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/importance_of_genetically_modified_crops.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/51043377883.pdf
    • https://cdn.shopify.com/s/files/1/0429/4718/2759/files/63019242075.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/pigafedezavoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7665/files/jejira.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/32981420505.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/96564423026.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0572/files/85650289329.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/clinical_laboratory_hematology_3rd_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/82632016967.pdf
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/ditelebakagewoguxose.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/
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/329

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006099.bin
0c517ef11386eca67bcb2b427ed9954b85c3ea6b2d0d6f16ee5ee10a21ec5dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 5608 bytes
font_01_sfnt_off00007381.bin
e76d1e10d4fb9e5344224fb327927374380624e46cbe661dacd45ac905b26bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7381 9796 bytes

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