Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3beda925f1ff5c…

MALICIOUS

PDF

40.5 KB Created: 2020-08-18 14:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542e5bfb14fa4f7e42dc6bba7c6e72e5 SHA-1: 449f425d8fc1f606d164793228afe5945c4972bf SHA-256: 4a3beda925f1ff5cff401a4c1824972c881e8bd5088ebb2536c345d7c91cef1b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=oxidation+reduction+reaction+worksheet+pdf'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, many of which are to benign Shopify domains, likely serving as a distraction or to improve SEO for the malicious link. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to a malicious site.

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.com/pify?keyword=oxidation+reduction+reaction+worksheet+pdf
    • http://remul.parislomas.net/uploads/1/3/1/4/131408970/e9f94d62.pdf
    • http://files.ctlcv.org/uploads/1/3/0/8/130873855/givij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/network_topology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/kendrick_lamar_poetic_justice_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0441/2583/files/622463578.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/office_2019_crack.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/nba_team_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/alphanumeric_series_for_ibps_clerk.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/93341460129.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38608120386.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/speaking_english_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5903/files/zunuwupen.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_off0000605b.bin
2e88d478c4440d8029f1e7b9e036065351d545792616f1e05ec245def1b08474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605B 5460 bytes
font_01_sfnt_off00007306.bin
53df5de6e9068313911ea9001c270d720dfc2181872ba1cdde55e9f3e7ff143a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 10068 bytes

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