Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a241aaa025475…

MALICIOUS

PDF

33.2 KB Created: 2020-08-30 23:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e46f01ef5f5607c75cd423c8988cb6d3 SHA-1: 3327f3da13a76df3471012cad513aabc151de172 SHA-256: dc8a241aaa025475cbf40c57d987da8cdf1fb4650f184911c3b370dd102f187a
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary redirector URL and numerous other links hosted on Shopify, suggesting an attempt to leverage SEO poisoning or phishing tactics. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=foreign+policy+theories+actors+cases
    • https://cdn.shopify.com/s/files/1/0461/6683/5352/files/lupimipubekimet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/tosomaxaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/dudijuguwugenojodog.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2090/files/kanigugafosoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/sugazisaxazunifurup.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c60dc9215f24256a5f9b967047a8e19.pdf
    • https://static.usrfiles.com/ugd/dc98cc_5b9a3c54b15d476cad6cad9e784a2078.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f878df0ea8b4a448d5abcb9aa01e1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_825bd7d1a2074e9fba7e7e164ce6d92f.pdf
    • https://static.usrfiles.com/ugd/f103bb_14745eb7e43b4fdc83dee0f807c895d3.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/bigerufikolopije.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/les_bienfaits_du_sport_sur_la_sant.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/linkedin_profile_url_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/narapibijifexanusu.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_off0000480c.bin
bd8c4df2dd2fb9812105638674bf03d49ea8db8b8e6ca405ba51d424a654f111
pdf-font-stream PDF embedded font (sfnt) at offset 0x480C 5252 bytes
font_01_sfnt_off000059e9.bin
930b97f37950c4cb6c6cea700447e858dbd6bbd24114605621e9520def407a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 8820 bytes