Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ad5312f9a511ad…

MALICIOUS

PDF

48.4 KB Created: 2020-07-31 20:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3c1d75e7fc194063c61dacbe6dc294 SHA-1: a75e3b0e1553387bd33fe4ca14e5482eb929000f SHA-256: 84ad5312f9a511ad03f92a5985672a01fa6252b06ed458a096803ef57e48494b
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=microeconomics+for+today+8th+edition+pdf, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'microeconomics' and the authoring application 'wkhtmltopdf', reinforcing the lure of a textbook PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=microeconomics+for+today+8th+edition+pdf
    • http://files.smallbatchq.com/uploads/1/3/0/8/130814644/1ce237eaf92.pdf
    • http://files.poconolakewesleyan.org/uploads/1/3/1/6/131607522/fowutilog.pdf
    • http://files.wcpestcontrol.com/uploads/1/3/1/8/131871618/sasekaginododowule.pdf
    • http://files.fourseasonsyouthorchestra.org/uploads/1/3/0/9/130969300/3d2f8af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/enter_the_gungeon_life_orb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/97076836022.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/suzubedimosejawawedolot.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/dotukeganelojukubetedit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/11836807700.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/basic_concepts_in_pharmacology.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1319/files/zixorukededipisajunixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/nzvoslov_anorganick_chemie.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/pijadewatizotumor.pdf
    • https://cdn.shopify.com/s/files/1/0429/0114/3715/files/29512911026.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/vusujawuzas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/18096256824.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/mazeb.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_off00007c38.bin
04310d66294b0c1326d17c7d086a620f0fa04bb28c27f9f7ad977ef592f0550c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 5664 bytes
font_01_sfnt_off00008f6e.bin
28b680c5a636bad7a79442033c848e354a7f739ab6d35d7daaa4154315624829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6E 11112 bytes

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