Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfaafa78ae1805d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 05:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39b13d1a638a36837fd0e32ce15d142d SHA-1: 8bd0c51b6d68132e89131de9f93f66e452ce71da SHA-256: 6dfaafa78ae1805d990e5e681720efe461da4dd49eddb2616184f91c59591665
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=jf011e+cvt+pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the embedded links are the primary attack vector.

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=jf011e+cvt+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1607/4902/files/75736907347.pdf
    • https://cdn.shopify.com/s/files/1/0432/7086/5052/files/public_speaking_topics.pdf
    • https://cdn.shopify.com/s/files/1/0438/7448/4379/files/nosolenubomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/151416174.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/58659660430.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/amalgamation_of_partnership_firms.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1832/files/jaluxifixororonanikige.pdf
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/general_characteristics_of_non_chordates.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac8ba9cb165b40049bd01e7c91be5b7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4a68b5d6a54f698d1016d559f15ea0.pdf
    • https://static.usrfiles.com/ugd/b8c837_77ca199deae448acbbea2621e45f71ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/b8c837_624098937c8848638727b0fa276830b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccae4a17a7f04627bd4f1000765c3305.pdf
    • https://static.usrfiles.com/ugd/b8c837_23cbb0ad6bea40678c8891ef98565bb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7158018ce86b44ffa626a76abc9a9b06.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_off0000622b.bin
868e740b4f9c5748d6bc5dfcd85edabb2f302e2d684a0883d97b7f232283b007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 4876 bytes
font_01_sfnt_off000072ec.bin
c4a09c5f4415d9e4c6585ae0f8d339cfb55052093ef07f9941702569154eccc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 14592 bytes

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