Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e62888c54d6934…

MALICIOUS

PDF

44.1 KB Created: 2020-09-04 18:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12bdb9179eb89593b41ae212f6013331 SHA-1: f521813d15bd7cad95fcf13deeb4c327d5109527 SHA-256: 28e62888c54d69345e9738c1251dfe4878823d3669b1bff0b245842cc626d265
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a redirector. This suggests the primary purpose is to lure users to a malicious site. The presence of numerous Shopify links, while mostly benign, contributes to a link farm pattern.

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.club/wix?keyword=manualidades+para+navidad+faciles+de+hacer
    • https://cdn.shopify.com/s/files/1/0435/8635/5357/files/blank_fillable_monthly_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/bloc_party_helicopter.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/nevijusixuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/real_ielts_listening_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/ocado_group_plc_annual_report_2012.pdf
    • https://static.usrfiles.com/ugd/5c139a_8d4a60b6f3be40a2add8b26ba1c9629a.pdf
    • https://static.usrfiles.com/ugd/15ebe2_cf2c8dfdc0d34e48a7943aafbb8e5770.pdf
    • https://static.usrfiles.com/ugd/67f5f7_1c465c1e71d040ad84f3f37fbc06fa36.pdf
    • https://static.usrfiles.com/ugd/49be48_0b41e311b4c3486dbdb103de02904104.pdf
    • https://static.usrfiles.com/ugd/5bb01c_81cb419bfcae497ca6c360572fd3242b.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_off00006d8c.bin
970005327f5400564647b5ae2994dda520ad405eb78dabbaf2f252e36e15d5a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8C 5308 bytes
font_01_sfnt_off00007faa.bin
b235ae91ee6d018290c52be3724c1c4c028b11b07e7964c580793090399d2693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAA 10692 bytes

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