Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef5f97c8dd659fe…

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1493a64d3dd8a6652ac3412dfc1c8be9 SHA-1: 4afbf96a549546262bd54d101c4827a70e0a5484 SHA-256: 5ef5f97c8dd659fee0f08235643dd32bd1169cb5858f8aff6d3ea4a13f8e472d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of an SEO link farm or phishing campaign. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect users to harmful content.

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.ru/wix?keyword=amparito+roca+pasodoble+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/6978/7560/files/deutsch_english_and_chinese_visual_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0439/2773/2379/files/83377579978.pdf
    • https://cdn.shopify.com/s/files/1/0450/8496/7077/files/adobe_illustrator_cs6_for_windows_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4416/files/80951177613.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c0e2677d264bdfb97c9b6145d5f366.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/c068f8_3582541922904d7293d38fb5c1ff45c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_50199653541b47a692d79a1b27ef0e76.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d1f8fe4a33d46089843b871d05a5bbf.pdf
    • https://static.usrfiles.com/ugd/0aab01_c13a328e4b56494b834c0f1abd2be51b.pdf
    • https://static.usrfiles.com/ugd/6df952_bb461ce3bf204596b3ff4fcc2e62c74b.pdf
    • https://static.usrfiles.com/ugd/defcb2_cb4c219d8b5742288647748d4de2335b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/affaa6_7fb67a5fefdd4b9fbad97fe33507f478.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_e479103f143740d6864f48d40a749bc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bf6b409ea74fed8cf0887e40321912.pdf
    • https://static.usrfiles.com/ugd/6846fe_08060fa1b8f045b9852799c323fb561f.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.

FilenameKindSourceSize
font_00_sfnt_off00006ca3.bin
4e01cb7e83d0cb5da7b179b6f93f38b5bc9e0813ef95ed2077727a199021184f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA3 5432 bytes
font_01_sfnt_off00007ef9.bin
a29db62979bea08b9f16520c85019d0f82abbae01c982090ea33d19debf70b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF9 11228 bytes

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