Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44396c5c6a9926a…

MALICIOUS

PDF

47.5 KB Created: 2020-08-29 18:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a10378b5dce87c23cc90ad021cc70d SHA-1: 96a3f8b21af59580f74b83bdbb55f57aaead7890 SHA-256: f44396c5c6a9926a20f903d401a83fffa519ae7c02d3a84c8fad297203ac2102
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure to external content. The presence of numerous links points towards a link farm or SEO manipulation tactic.

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=best+amp+build+warframe
    • https://cdn.shopify.com/s/files/1/0454/1018/9480/files/61440358876.pdf
    • https://cdn.shopify.com/s/files/1/0464/7436/3048/files/insulated_steel_roof_sheets_uk.pdf
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/viruzigewawibekipesum.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/zilidepogumurudutijufafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/exponential_inequality_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22511335110.pdf
    • https://static.usrfiles.com/ugd/b8c837_8766446a74dd4406a44874d7c1faf0f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c019b9e74c742288d9546c192187095.pdf
    • https://static.usrfiles.com/ugd/83e24f_280a7311bbcc4231ba28923908b4abd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e2117e68b004dbc897498a972b48566.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_off00007bef.bin
efd086eafc953183f5acb672796f0c6b1cf3437562b1e8141a6ae0811293c385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEF 5468 bytes
font_01_sfnt_off00008e7a.bin
e2535c08bd8093afe098b43296c66c5ab47cbb3e39065a2985af419ad9f6ac26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7A 10196 bytes

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