Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06dc2e77eb4dbe8…

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83b1e4fba268db3924d2d09f7fd5746 SHA-1: 38a45bb7c71f22ae6ee2e8efdebca664a56e6c73 SHA-256: b06dc2e77eb4dbe839ac6a63d6ba423dd7dc2bb57dc0fe2279a50c8b1929ff01
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL designed to lure users with a seemingly relevant search query. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier also flagged this PDF with high confidence. The primary malicious IOC is the redirector URL, which likely leads to a malicious payload or phishing site.

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.me/wix?keyword=charleston+sc+water+quality+report
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/74143459167.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/binary_cross_entropy_keras.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0590/files/47472931981.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/molecular_biology_principles_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/cloud_computing_infrastructure_as_a_service.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/gatogepabusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/mcgraw_hill_biology.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/descriptive_writing_prompts.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/26247174288.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/acog_preeclampsia_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/fujefeziliraf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/temperament_scale.pdf
    • https://cdn.shopify.com/s/files/1/0434/3051/0742/files/java_programming_book.pdf
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/life_and_death_twilight_reimagined_romana.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5fdf1e2391744ed851fe6f5b12bb720.pdf
    • https://static.usrfiles.com/ugd/72b0e7_defe5f7351d04863a69dd085580017b7.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_off000070b6.bin
bcfd16cf963e770c794ff4cb095551f72458a1f0f34e860a1da8595d4b41ff87
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B6 5244 bytes
font_01_sfnt_off0000829a.bin
d71122434f6aa1829798a427cfff3a5112ad6dd0120c4ca045caefb3e40a5706
pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 10624 bytes