Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed8d1a6d185a29e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 09:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68d15f2adc9b9271de6a1a05247ded19 SHA-1: 68ca151d8870aa8de36556f53d629112406099dd SHA-256: 6ed8d1a6d185a29e9c9bb01a31738248a1130073bf8bbbe8512cf8d57f63dbc8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/wix?keyword=ejercicios+para+aumentar+autoestima, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing helpful 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=ejercicios+para+aumentar+autoestima
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8c3da6c33e784c88ad0a16bf27aa3bd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4ddae6f16c24df8802168dbf9c83dd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_def89ea1257645e09c74abcd83d51160.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e26aba2fe3248e48108a57d43fa3a8c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/53017405370.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/gozinuxesikipedunufege.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/1639947267.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/liwevozalidofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/bawixukepegafunepagova.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/online_json_formatter_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://static.usrfiles.com/ugd/b8c837_03bfdca873484d72bd1a03bb24b2f9a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2cef5258e2f4b43b3ac8039376843e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_adf1e05142ca4a52861a99efe5ed1804.pdf
    • https://static.usrfiles.com/ugd/b8c837_b11d34bfef5b4b889ad007d69733c5ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3280a7840346168bfa1539943b65ec.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_off00005d54.bin
6f9f38c50a41198b61e6d7f8a1dd7c9ebab90acf1836bae10a780b66de7eb568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D54 5080 bytes
font_01_sfnt_off00006e81.bin
960b1aacdb3b7acc7ebe6ac30f8f501d18c2d928322752bdce12adae0219c16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E81 10572 bytes

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