Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8975ba8557c9446…

MALICIOUS

PDF

42.8 KB Created: 2020-08-08 16:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af1be3a905fdc0ada1caf55d7c52313 SHA-1: 402c088401756ccc7f2bca6122a515054cf8c196 SHA-256: d8975ba8557c9446742ee1205089b591c2f0f7c5df59c42f7c310587adf63a3d
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to fractions and the wkhtmltopdf tool, suggesting a lure to disguise the malicious links as educational content. The primary malicious IOC is the redirector URL.

Heuristics 3

  • 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.
  • 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=adding+and+subtracting+fractions+with+like+and+unlike+denominators+pdf
    • http://files.margapictures.com/uploads/1/3/2/6/132681670/nifopono.pdf
    • http://zanati.spencerclarkphotography.com/uploads/1/3/2/7/132740435/xikoju-zufebovikatena-limelined.pdf
    • http://files.hearmyvoiceonline.com/uploads/1/3/2/8/132815882/70be068395bfc6.pdf
    • http://files.esscliao.com/uploads/1/3/1/4/131453967/9162139.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/savaxelekubonula.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/algorithms_of_oppression_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/65530493620.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/table_calendar_2020_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/83680384822.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/how_to_accept_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/fuguwafubinobizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/the_replacements_tv_series.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/ruzifagezajogopiwem.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/8867911104.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_off000065c3.bin
463a41d8cfdb62417e212d3aae8bd2cc668e5a0ec70482b0965df86e177c79ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C3 5856 bytes
font_01_sfnt_off00007997.bin
c1bce77057eb2d93f4ead8f33a887141d5d2d7e56a9be311eb4c57b7988bbb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7997 10576 bytes

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