Malicious PDF — malware analysis report

Static analysis result for SHA-256 496eddb3d6dfc113…

MALICIOUS

PDF

43.1 KB Created: 2020-07-25 09:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b50506b943d7523ae4aafc193345ae1c SHA-1: 6a18aed3615a7c360d9b2cf4311fbc1a7cb3b758 SHA-256: 496eddb3d6dfc113e4bc6acec8e3d5b6cf90e4ad24f75ae8b963bc2d86dcfd90
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning technique used to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector link.

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.com/wb?keyword=ordinal%20numbers%20worksheets%20for%20preschoolers
    • http://files.naughtypup.net/uploads/1/3/1/4/131453124/730915.pdf
    • http://files.herveybayorchidsociety.com/uploads/1/3/0/7/130739802/vatijedevaz-tumopewerusod.pdf
    • http://files.dlsu-soe.com/uploads/1/3/1/4/131453214/71d863ba3b7db22.pdf
    • http://files.newparkgames.com/uploads/1/3/2/3/132302926/ritifibu_nibimadifiv_deladexoza.pdf
    • http://files.syrianmigrationsolutionsproject.org/uploads/1/3/0/8/130874627/xujevamurezifo-lizejigadaroni-satugom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/44924675589.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/97296905174.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/1519210917.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/61654671422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soreluseloxajakikolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/vuvasazovoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/lerib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/wavuwesobez.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/kimilik.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/
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/97296905174

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006979.bin
1f54b55ef604b1021b4da23775f95a8cbe284b45c2875f7aaa8a0481418ab5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 5600 bytes
font_01_sfnt_off00007c61.bin
a285a111b73b260040ada08aa004270215617f0ba04244363b69009bc23f9eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C61 10088 bytes

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