Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b55bad1ea4a2b2d…

MALICIOUS

PDF

48.7 KB Created: 2020-08-21 20:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389ae3e035a5b3115d440a94db7e2db6 SHA-1: a1a401e0c3c55d5f9da2ef6ec5dab728bb5f2cc2 SHA-256: 3b55bad1ea4a2b2d4dc044315168469d825290d5916236c943da7e1be1e0bdbf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and a related keyword, suggesting a lure for users interested in 'aluminium windows design'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=aluminium+windows+design+pdf
    • http://sevidajat.modelcitizenrecords.co.uk/uploads/1/3/1/1/131164424/b23185d636e33e.pdf
    • http://vuwomozu.artculturevs.org/uploads/1/3/1/3/131379394/debazemololumobug.pdf
    • http://mowipu.tacvet.com/uploads/1/3/2/7/132741073/delekasodewitedana.pdf
    • http://tuwirenu.blueheronstainedglass.net/uploads/1/3/1/3/131380404/5386087.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/14898098469.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/rinepexexukatuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0429/6507/4086/files/muxuvum.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/kosemizeferepanegopan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/e_filing_26as_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/business_case_presentation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68736518606.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/92394774993.pdf
    • https://cdn.shopify.com/s/files/1/0439/1868/8424/files/gevolilomifofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/91709726833.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/dukepepedakemusop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/xabepajaragex.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/tevopelenisokopetubofeda.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_off00007868.bin
3cdd2e8ed59982b1b44dd72ff2707647560ebc09ed6cf498da456f3a015b4501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7868 5136 bytes
font_01_sfnt_off000089e6.bin
1c8b4ca227a0446dd93453c5630d6b37a24653d4c16ebe6f81b523cdf51e5fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E6 13748 bytes

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