Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dff58e088c737c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-20 14:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7814a27b5665c4dd20f61c095a1ff06a SHA-1: fffb76f032eebebffdb209b4ba7544df2fe7c92a SHA-256: b5dff58e088c737cf8df6d6febf9d1e3f07d98ef19e2fff761ec79a389340529
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to a 'nursing inservice sign in sheet' and includes the malicious URL, suggesting a phishing lure. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination.

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=nursing+inservice+sign+in+sheet
    • http://files.whitewongpt.com/uploads/1/3/1/4/131454158/robeguba-puzutilimu-lawuvawa-zugefawojavina.pdf
    • http://zaves.petalsnherbs.com/uploads/1/3/2/7/132740930/jeferagis.pdf
    • http://files.seasunland.com/uploads/1/3/1/6/131606844/5765b3f.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/73231044938.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1039/files/31994123212.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/74052687704.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/48907993145.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/30426300388.pdf
    • https://cdn.shopify.com/s/files/1/0441/4049/5000/files/birdman_film_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/86847721814.pdf
    • https://cdn.shopify.com/s/files/1/0436/3934/1216/files/finding_gcf_and_lcm_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/7033/8725/files/bifibuxojelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/manos_que_curan_2_barbara_ann_brennan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9845/5705/files/sap_payroll_process.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_off00007c16.bin
1ee883145e159758e5a59314260f01051fa1dc31f778b92ff8a5a4ecd62d33d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C16 4848 bytes
font_01_sfnt_off00008c9b.bin
a145e93e00ea2c5c82641395c1c2d7bbd77cd9df8ebb7a3ac429fc53c8203806		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 10120 bytes

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