Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa5477b9910c68…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 07:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 029134b5bdee3bc70491cd39d8b7e5b3 SHA-1: 76535521e8afc6fae198fd702af1df31e4af5d5e SHA-256: c7aa5477b9910c68b61e741bd95d426e0ecfc2fc477ea635703ff3df86992b94
150 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 'https://ttraff.cc/pify?keyword=resignation+letter+template+free'. This URL is presented within the document's body, disguised as a 'resignation letter template free' lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content or to obscure the true destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=resignation+letter+template+free
    • http://files.nspirehomesolutions.com/uploads/1/3/1/3/131380343/6a4acd81f7193f.pdf
    • http://files.90sinmypocket.com/uploads/1/3/0/8/130814229/249840.pdf
    • http://files.theequineinsider.com/uploads/1/3/0/9/130969012/2511219.pdf
    • http://kunupunus.rescuedfirewood.com/uploads/1/3/1/3/131383541/3829052.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/2019_election_results_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/55439510455.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/husqvarna_128ld_attachments.pdf
    • https://cdn.shopify.com/s/files/1/0430/5269/5703/files/lewobawujobenosalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8330/0005/files/27853154713.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/tatebulazoruto.pdf
    • https://cdn.shopify.com/s/files/1/0440/5090/7286/files/towopuvububug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4429/1228/files/31034432659.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9175/files/32826396319.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/sonituziverobugevofixadu.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_off00006302.bin
f669123e0a33acd94ca76b5c76342df8286b628dc5455876a49a31a28330c79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 5228 bytes
font_01_sfnt_off000074bc.bin
d5b87a89fec448107c9ccb176906ee61e86bad119edc31acb4865744620dbd65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 10568 bytes

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