Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11d50b6898e48de…

MALICIOUS

PDF

41.6 KB Created: 2020-08-04 02:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54f660a5c8b8e0be1ce9c883a48ab2b1 SHA-1: 656c6980406fd2ce5685dbb0bf6aab0384d58928 SHA-256: a11d50b6898e48de213176d0f8e6182c6fc537c09d1c5393e7cb8a5f6281b147
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Animals worksheet kindergarten pdf' and a URL that appears to be a lure. The primary heuristic firing indicates the PDF links to known malicious redirector infrastructure, suggesting the intent is to redirect users to malicious sites.

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=animals+worksheet+kindergarten+pdf
    • http://files.mitsstools.org/uploads/1/3/1/3/131380849/5b4d8dbf0b5e8.pdf
    • http://genemuwi.destinationsbyrachel.com/uploads/1/3/0/7/130775934/e0f496b.pdf
    • http://files.lilyfontas.com/uploads/1/3/1/3/131398010/waxidixu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/retefafunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/37514191659.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8113/files/wolunuzukan.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5594/files/amana_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/rizisalumirifemuxedero.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88406012193.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/5656833052.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/acls_provider_manual_2015_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4680/files/928719953.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0033/files/23168912371.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5348/files/lujalosapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/lumuxoboredoribetobuwemu.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_off0000649a.bin
60ecfddf1c2403473a8b6ec45fc48a3f22e5935e7f931bcae6d4bd8e652e5c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649A 5600 bytes
font_01_sfnt_off00007784.bin
30bf5d8981601d6040d36ad30af8803da8a7f5be7065784d243ca76bb307d46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7784 9948 bytes

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