Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f5b732c9ee3b14…

MALICIOUS

PDF

41.1 KB Created: 2020-08-28 13:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e36bf2e40c73ee73c4d719f298b833e9 SHA-1: d9877b2a1e1aa7a8336cb71297c731f51e80bb9e SHA-256: e6f5b732c9ee3b14281fd8e9e20862ed3948f93134488985c9ec45ce82df5c89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/pify?keyword=mikhail+chigorin+the+creative+genius'. This redirector is part of a link farm strategy, as indicated by another critical heuristic. The document body, though heavily obfuscated, also contains this URL and several other PDF links hosted on Shopify domains, some of which are confirmed benign, but one is unknown. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=mikhail+chigorin+the+creative+genius
    • http://files.valerianaq.com/uploads/1/3/0/7/130775484/mumuziridorixakot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/formation_accueillante_autonome_bruxelles.pdf
    • https://cdn.shopify.com/s/files/1/0438/1219/2413/files/54994341020.pdf
    • https://cdn.shopify.com/s/files/1/0462/4351/2474/files/cantonment_board_chennai_recruitment_2019_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/wubilekurofur.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/adobe_reader_dc_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/pozalujugibabakelekizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3119/1975/files/46109425688.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/9661493616.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006062.bin
aefde5d4b180d11e3687b109cb3dc7faa98fbc359aa7080fe90d400b0895e7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 5188 bytes
font_01_sfnt_off00007205.bin
238dab2c57bcd2059178b1cb8a5b6203e2990f340642346f35397c0dad017510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7205 10676 bytes

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