Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0efe5a30449950…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 09:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 637b5d0aaa2fc13fb6166f7be3253465 SHA-1: 888700bf4e2549c0a74d47e85bd1ddba6a94e700 SHA-256: 0e0efe5a304499506b5d495a7abd9315bbcbd44b0a53ae4300f634a3c86234d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector service. The document body includes a search query for popular media, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload.

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.link/wix?keyword=cinderella+and+four+knights+ep+1+eng+sub+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0695/0550/files/ceh_v9_certified_ethical_hacker_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/neuro_linguistic_programming_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/bleeding_from_the_digestive_tract.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/job_advertisement_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/adrenal_gland_function.pdf
    • https://cdn.shopify.com/s/files/1/0449/7299/8815/files/machine_learning_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4223/3755/files/36245825825.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/separation_agreement_ma.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/95840513589.pdf
    • https://static.usrfiles.com/ugd/e78b77_addc58f1d4ed470880479331332a07ef.pdf
    • https://static.usrfiles.com/ugd/36f25b_c0462d41c0e2400b880e5314aa8e6c82.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee9db509fe3b41b8b98ae1688667e26e.pdf
    • https://cdn.shopify.com/s/files/1/0452/5296/8609/files/17938291799.pdf
    • https://cdn.shopify.com/s/files/1/0447/7802/9213/files/bel_canto_novel.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/86632618402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f95.bin
2a52ae07cedbb87503872de710ba2c6342870768c030cbe9cd267a54e3a882b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F95 5580 bytes
font_01_sfnt_off000062b9.bin
00321a225f4f5b7c8d2d8e19d73d3864a621bdc9a8122c676b3026c982ca1ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 5556 bytes
font_02_sfnt_off000075aa.bin
1bea748a4f78f603533917d83ee07da6d40dd3e458978eae054c8c5cc287d8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 9872 bytes

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