Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bf4038d2ff979a…

MALICIOUS

PDF

49.9 KB Created: 2020-08-28 19:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58f7055a7ff90a09609c3cd67f76869 SHA-1: 209c6c3059a78b24cad453f3584c8d1b4f42b2d6 SHA-256: 61bf4038d2ff979acfb42d19a66d0f0599dc30f176d30bd15d777748df1ffb93
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. It also exhibits PDF_SEO_LINK_FARM behavior, embedding numerous links to external PDFs, likely for SEO manipulation or to host further malicious content. The embedded URL https://ttraff.cc/wix?keyword=melhor+livro+de+direito+administrativo+para+concursos+2018 is flagged as a malicious redirector, suggesting the document's primary purpose is to lead users to harmful sites under the guise of providing study materials.

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.cc/wix?keyword=melhor+livro+de+direito+administrativo+para+concursos+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/63744475456.pdf
    • https://cdn.shopify.com/s/files/1/0446/9984/4762/files/petit_livre_pour_apprendre_l_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/gimaxinitarakagopilemux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/vuduzapejazoz.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8830/files/58937472291.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/tuzozomidanopixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/koxamikelab.pdf
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/23548443190.pdf
    • https://cdn.shopify.com/s/files/1/0438/5108/8032/files/nefavudivelezorexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6849/7823/files/95500082271.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6568/files/how_to_write_autoethnography.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/gowolowaweza.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/35995824110.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_off00006ff6.bin
4869ec76bef324f1c563ef4f84aa5ab24588ca39bd0eb5509410b6399229a363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 5780 bytes
font_01_sfnt_off00008389.bin
094fa2a0d91078b8b0042c45c45f235241f05f716a72767def2f41bdff101c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8389 12380 bytes
font_02_sfnt_off0000a9ae.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AE 4324 bytes

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