Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f8e86598f63842…

MALICIOUS

PDF

42.8 KB Created: 2020-08-13 03:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0adaceeff6d81f5f8935df8dba07cf96 SHA-1: 28ef8866c6e8a4438b4d7f70e08fb7346bea3b1c SHA-256: 85f8e86598f6384266f083e99dc313afc9be6c64ab2aecd3798846cbc1798ef4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=otitis%20por%20malassezia%20en%20perros%20pdf'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/wb?keyword=otitis%20por%20malassezia%20en%20perros%20pdf
    • http://ranetus.sirfa.co.uk/uploads/1/3/2/8/132814930/bifita-desirawew-velowoduw-wovofesi.pdf
    • http://rasopax.southeasterntruckbody.com/uploads/1/3/1/4/131407068/gufofaxusaw.pdf
    • http://files.choisnuts.com/uploads/1/3/1/3/131381640/bitopok.pdf
    • http://files.cpi-plasma.com/uploads/1/3/2/7/132712116/dikanavowakomab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9465/3595/files/walamive.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/guvividimofugifuruja.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/jeveputukelopabijepesesij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/gudetujelosekusak.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/bender_gestalt_test_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/carte_touristique_auvergne.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/90225904603.pdf
    • https://cdn.shopify.com/s/files/1/0436/0486/9277/files/wiser.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/invalid_active_developer_path.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/tufelejajojuso.pdf
    • https://cdn.shopify.com/s/files/1/0438/1969/6288/files/acidos_y_bases_organicos.pdf
    • https://cdn.shopify.com/s/files/1/0452/4287/6061/files/62108345948.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_off00006739.bin
da8a00f352b89edba9abc2bf20af40a86ea09e7aea31841cf797ee889bc9647b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 5264 bytes
font_01_sfnt_off00007902.bin
3c6775353f32146ab739066b9126f69d5c98b628a802efc3a664065d69642c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7902 10996 bytes

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