PDF malware analysis — malicious · 88d550d2d6b03254

MALICIOUS

PDF

38.7 KB Created: 2020-09-04 22:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 4e630836316b19a39e9569bbd4787d8f SHA-1: 526f6d4278a626eeb0fdc626aa236e2d0ddff77d SHA-256: 88d550d2d6b032544a71276679b9f0c42c8834e436059a51e44f802d4c847835

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to Shopify and other benign-looking domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO manipulation tactic to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs supports the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.club/wix?keyword=types+of+sentences+worksheet+6th+grade
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xozujegemuzudileruzodedus.pdf
- https://cdn.shopify.com/s/files/1/0444/2914/8327/files/64653789622.pdf
- https://cdn.shopify.com/s/files/1/0434/2287/5797/files/fester_s_quest_nes.pdf
- https://static.usrfiles.com/ugd/6116da_4c7b0552e54a45868183762fa435f076.pdf
- https://static.usrfiles.com/ugd/0d002d_d944328b535141f28fbced7ec1d22a87.pdf
- https://cdn.shopify.com/s/files/1/0431/5476/8021/files/ramanaxulepuludeboder.pdf
- https://cdn.shopify.com/s/files/1/0433/8660/1639/files/cessna_210_parts_catalog.pdf
- https://cdn.shopify.com/s/files/1/0431/1053/1238/files/warfarin_guidelines_uk.pdf
- https://cdn.shopify.com/s/files/1/0429/2630/9535/files/23370394009.pdf
- https://cdn.shopify.com/s/files/1/0432/0090/5373/files/data_structures_and_algorithms_made_easy_in_java_download.pdf
- https://cdn.shopify.com/s/files/1/0431/4152/9762/files/gjensidige_annual_report_2015.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005831.bin` `6f79e6a5e53e7eaed8036df3c7632da5b94ff5ed5995c07a7fc7d89cac688d78`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5831	5744 bytes
`font_01_sfnt_off00006be1.bin` `a20d5a7d0732d067c5c4b16368ab2e759f64f89bf1a083a3fd880ff90472f7d6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BE1	10080 bytes

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