Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e8820d5fa0cb0d…

MALICIOUS

PDF

46.3 KB Created: 2020-08-22 18:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c127f5c81a0238efc1365f5ac18f4a77 SHA-1: 1c6fac8a04974a1f98b23f4098fc6ba3ee6459b3 SHA-256: d5e8820d5fa0cb0d234e07ddc8f58de68c7e0ab214b39dffa129f9eb3ea228df
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised within content that appears to be a physics lab report. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is designed to lead the user to further malicious content. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm used for SEO poisoning or distributing malicious files.

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.cc/pify?keyword=moment+of+inertia+physics+lab+report
    • http://files.aaltowib.com/uploads/1/3/1/4/131406806/3529480.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/64687301962.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/xugakunegisagofinugiga.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/wagitudinaxesavutabaxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8363/5619/files/70092280406.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0434/6770/2432/files/wabetupedovawojuwalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/guweralim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/65778830173.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/3937174950.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/pufiwuxejanovuful.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_off0000774f.bin
2fee4b35f943146a39ae4f827bc5b4823af76fc1b07c891dddc656b7465d9795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 5500 bytes
font_01_sfnt_off000089de.bin
657b56b4041560d5df03ff1ad4d550b7d072289f32de1ebdd80cf6053884a5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DE 10076 bytes

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