Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a8f4f3c82ed926…

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0270ebd6979514c9cb3fc46ead65fc6 SHA-1: f7cabba26e52cd0b69c0353b533d109921a11cf2 SHA-256: e4a8f4f3c82ed9263cfd9076cd0e1715bac0a68c35422f0c4c4c5e9dddbcb485
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=extended+end+plate+moment+connection+spreadsheet'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. While other links point to benign Shopify domains, the presence of the malicious redirector is the most significant finding.

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=extended+end+plate+moment+connection+spreadsheet
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/34400516255.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/cash_flow_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/free_printable_synonym_worksheets_for_3rd_grade.pdf
    • https://static.usrfiles.com/ugd/b8c837_109589f5aa754801a4c57c9094c49bb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0db9ade3fb8a4bf696c58fb475f2e1d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3c1d65ba4fa411aa6448037372a4910.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/28799666260.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/wejisebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/55420107516.pdf
    • https://cdn.shopify.com/s/files/1/0440/7531/9448/files/riramatadowidiranajeboga.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_off00004fe9.bin
a3619cd2e4e71c28be4ad6d8a3e35f62cad7311d3064092a8ee26b33baafe660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE9 5340 bytes
font_01_sfnt_off000061e0.bin
6a73d23bfbedd2e0b5ee64a9b2a997c191ec29530d4ab57a0fb1efc51a6f42a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 10184 bytes

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