Malicious PDF — malware analysis report

Static analysis result for SHA-256 8289ea04c34496dc…

MALICIOUS

PDF

48.1 KB Created: 2020-09-01 08:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 435a35a73627e22f2a30857d42caf502 SHA-1: e93b81814a96cfcb0438620e72d0af27425a39ee SHA-256: 8289ea04c34496dc8fd8f1a87329fa0d112e7c38a6395cbe76a8af7f397561b4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body text, though heavily obfuscated, contains the malicious URL, suggesting the primary purpose is to redirect users to potentially harmful content.

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=low+anorectal+malformation+icd+10
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_95b63f57fc54495db8ce1454c6586e8f.pdf
    • https://static.usrfiles.com/ugd/36f25b_0ae5e7b160e5420387244e23d2c6764a.pdf
    • https://static.usrfiles.com/ugd/eda9ba_7658a9f8f8ed4cbc9af05ef636705e1a.pdf
    • https://static.usrfiles.com/ugd/5ecadc_12f5d5d7603648a087d9c59572b8f0be.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/54723812736.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/43539888207.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/altivar_312_manual.pdf
    • https://static.usrfiles.com/ugd/451a43_1b67047da3654538afad0b0b1f778a27.pdf
    • https://static.usrfiles.com/ugd/b8c837_03b79bbc41cb40b0a2e6c983721a8b59.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/93729955974.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/kowexujasewe.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_off000074c0.bin
14868ef98fa1987c6580079b64690e3e9a55047001a53476c148ac2e9810f033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 5216 bytes
font_01_sfnt_off00008682.bin
57d8fd226be6f4f499fd2a35d2df9a73bc917412cde47dc9b6ad5bc2ae2c6bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8682 14508 bytes

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