Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4d51e2fffa41c7…

MALICIOUS

PDF

41.4 KB Created: 2020-08-18 17:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca7c484852b8b540d99855ddebeb8ea SHA-1: f5ef224c3ef460444cfaee6aaea6a15f5a30e884 SHA-256: 5a4d51e2fffa41c71ed3b628cf415294b72473802d4ddf19d71ff8f3bc9555d7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to software downloads, suggesting a lure to trick users into visiting these malicious sites. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=mozilla+firefox+47+portable
    • http://toxaleju.northsouthhockey.com/uploads/1/3/1/4/131407068/wobokikasezuxitalele.pdf
    • http://files.emmamccabe.com/uploads/1/3/1/4/131453605/531c7895d2ee.pdf
    • http://files.epic-aroma.com/uploads/1/3/0/8/130814605/puxegu-fidor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/tavaropuxokot.pdf
    • https://cdn.shopify.com/s/files/1/0435/3284/5207/files/dell_latitude_e5400_specs.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/tenaziwolen.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/niwesokiwavit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/pedepubatijirusisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/53768214694.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/pizagukonirure.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/73382033309.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7702/files/lolutavapuzodageg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/remipewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/wilepomufazetiwejozemot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/81919041813.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/65386721752.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0633/files/2006_toyota_sienna_service_manual.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_off00005dd6.bin
e6bbcf614918fa7e668b24446e0d07a738a723a3fac28c16273447cd8bd73cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD6 5148 bytes
font_01_sfnt_off00006f85.bin
790a6042e90968be40210b6ab4c46fc80db55402766f4b99fa7e5246b200ad00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F85 12840 bytes

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