Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cde0e05b72a797…

MALICIOUS

PDF

40.7 KB Created: 2020-08-12 22:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02711b3e269edba5755fadf9e77a96e9 SHA-1: e392a08a36c7067bfa4a933fe83ffea14f332ca3 SHA-256: 49cde0e05b72a797553eb5aff28b5e41a50f65ea00f4ee105d0e9720a9f11a36
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify-hosted PDFs, likely as a SEO poisoning tactic. One of the embedded URLs, https://ttraff.com/wb?keyword=main%20idea%20worksheets%202nd%20grade%20pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure to encourage clicks on the malicious link. No scripts were extracted from this sample.

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.com/wb?keyword=main%20idea%20worksheets%202nd%20grade%20pdf
    • http://files.hcwildlife.ca/uploads/1/3/2/7/132711965/a0281e28.pdf
    • http://files.logantstark.com/uploads/1/3/0/7/130740165/batofam_xapulenini.pdf
    • http://bekowa.biologicalwasteexpert.com/uploads/1/3/2/6/132683014/0e51a6668.pdf
    • http://files.12utct.com/uploads/1/3/2/8/132814342/908623.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/junud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/capsule_size_chart_acg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/pamazinumonodutu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/sakoru.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7914/files/96754222106.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/medical_english_dialogues.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/php_append_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/rojila.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6117/files/surface_area_and_volume_of_rectangular_prisms.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/ginenedinokid.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/43400908813.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_off0000606f.bin
a23e003b0a577d966fb8dc2cc04de66c7bd337ab3a42aa7de43e04bfab2ea073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 5564 bytes
font_01_sfnt_off00007375.bin
5424109f311f7cb9403e7d8ff7582121d3ed38b960ea8dcd82ac99fe539799f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7375 10060 bytes

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