Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3acef73f07ffb4…

MALICIOUS

PDF

33.0 KB Created: 2020-08-29 02:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc48e6e3ab37c336d8832a05041dd8f SHA-1: b9287368cd74208738e93801e6d2719c44ad92c1 SHA-256: 8f3acef73f07ffb40258219257ee152a9e601898c7207399f552a849a4c1049d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that points to this redirector. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning attempt to distribute malicious 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.cc/wix?keyword=pacific+rim+altyaz%25C4%25B1
    • https://static.usrfiles.com/ugd/b8c837_12d3a3c1e10e4ede814578c8fa38c216.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8efc84ac797149e7b103bb65430a3f90.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cad3769a64b436eaf0587d4bffad57c.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/80003783919.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eb7c0c4a5ac4d84ac2deba233118111.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f64b48ba92745fcb58da6a16f35c53d.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa31fdb34c2c4170a71b12bf901b44b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7877b9763f2e40b19743e642d20e898c.pdf
    • https://static.usrfiles.com/ugd/b8c837_79a4e57205f04ba58e0393a2ba477be0.pdf
    • https://static.usrfiles.com/ugd/b8c837_25c13feeb3984f12b9e95bd3a6e0c349.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_off000042ea.bin
8e5074c1ed32cf25b849cb8bf946f53e3e2f8e93dbd409867df2e1b07412c1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42EA 5032 bytes
font_01_sfnt_off000053fa.bin
b912ac468a110f8cd79cdd3914d88b989038dfee3dafdae82f19753d199be401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53FA 10132 bytes

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