Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fa99f9448928a4…

MALICIOUS

PDF

36.9 KB Created: 2020-08-15 13:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 717ff5077385451e567bcbd7d6341c1c SHA-1: f35ec786c0753e7f0057f1c45e44cb7df51e1de1 SHA-256: 81fa99f9448928a4e2a56a63be950117ad3eaff2f3b2e43280904c069a1a435f
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 pointing to Shopify domains, but the primary link redirects to a known malicious domain. The document body text, though heavily obfuscated, contains keywords related to educational materials and the malicious URL, suggesting a lure to trick users into clicking the link. The heuristic firings confirm the presence of a malicious redirector and a link farm, indicating a phishing or social engineering attempt.

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=bse%20odisha%208th%20class%20geometry%20book%20download%20pdf
    • http://files.cvcommunitychurch.org/uploads/1/3/0/7/130776416/sevujaruz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0535/files/29273269817.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/vepiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7554/files/wevevurefane.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/kaplan_property_and_casualty.pdf
    • https://cdn.shopify.com/s/files/1/0428/1040/9126/files/34641165095.pdf
    • https://cdn.shopify.com/s/files/1/0451/6030/0698/files/94274079479.pdf
    • https://cdn.shopify.com/s/files/1/0428/2541/6860/files/advanced_engineering_mathematics_5th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/4254816119.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7682/files/pugavogitef.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/65841380427.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/muvizula.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/rujuramofit.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_off00004d3a.bin
6bc006fba5e1c56dd7d84be196bf9d7df6579b2c8aca9566d2961bf925b99526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3A 6212 bytes
font_01_sfnt_off0000624d.bin
d750d143b5683c7494382f417e701c0b5a2c4f8cb7c1bc30889863a4c953b6c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 11008 bytes

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