Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcfe90c72aea21c…

MALICIOUS

PDF

36.7 KB Created: 2020-08-30 23:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bd1d0ebbdd2aaef875cc561cfc6d217 SHA-1: 8cd6d0d4396abeabba630b2478c54c89e09ad8f3 SHA-256: 9bcfe90c72aea21c27ef327b260e48fb04cc1b69925e96faab69303e73f75828
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO spam and phishing campaigns. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Principles of microeconomics 8th edition pdf mankiw' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious links as legitimate search results. The presence of multiple shopify.com links further supports the SEO spam vector.

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.ru/wix?keyword=principles+of+microeconomics+8th+edition+pdf+mankiw
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/mikutasenazukafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/44417331154.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8969/files/thermal_properties_of_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0431/7675/5349/files/ccnp_security_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/75683022673.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/gaxidodoz.pdf
    • https://static.usrfiles.com/ugd/b8c837_270e606902264b7b99ef22250449bfd0.pdf
    • https://static.usrfiles.com/ugd/c63dba_1ff8b900c58b4ce69269cabf90e53088.pdf
    • https://static.usrfiles.com/ugd/4bb894_e48de78831434e23ab50dd98bbc754e8.pdf
    • https://static.usrfiles.com/ugd/2274a7_2801aa2b321347f38d87a5cdaf2a3350.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f949fd4c32245dea35cfdcd393a6c3a.pdf
    • https://static.usrfiles.com/ugd/0047a4_4afe3c7e81e446e59582bbe6429a638a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b617370c43ad47229a90c2b3610463ac.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000503c.bin
f22d69df2267d34bb2b4696baff181133cfa8e063db0048dcfec242850bd6b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x503C 5744 bytes
font_01_sfnt_off000063a5.bin
e529d20a9db6fe798feaf31a63e502c33b82e96f2e3df987493d941122b7abe7
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A5 10012 bytes