Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5513b89f35baf1…

MALICIOUS

PDF

61.9 KB Created: 2020-08-30 09:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd8e354135d54f23976e6470745a4229 SHA-1: a724c90aa493bfdd7a4491ed366708f00fee06e8 SHA-256: bb5513b89f35baf139ddf6a2189b60c27a314c5dabe4770df84be7883a2d63f2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, using a lure related to a Warren Buffett documentary. This indicates a phishing or social engineering attack. The PDF also functions as a link farm, pointing to numerous other PDFs hosted on static.usrfiles.com, likely as a method to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=becoming+warren+buffett+documentary
    • https://static.usrfiles.com/ugd/d5cf39_12506e08116d483e96c6792bc8a60303.pdf
    • https://static.usrfiles.com/ugd/a59130_7c0fa25f105d4467b7252870c18720b9.pdf
    • https://static.usrfiles.com/ugd/8b2c09_1ea89c5f32784793aced0d0856b448fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6ba4b36a0154c989d0c4a13047bd913.pdf
    • https://static.usrfiles.com/ugd/b8c837_37c45fd240a541bcb1f82a62aa723d5d.pdf
    • https://static.usrfiles.com/ugd/b11f6d_ff32305b473c45cca0f0e6693afbaabd.pdf
    • https://static.usrfiles.com/ugd/ace02d_6002e91e5a89494b9a713293aa819e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0488c9653454262809efc29948d737d.pdf
    • https://static.usrfiles.com/ugd/7198c1_7cde32ce56a1485bb12012d9d57d80cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_64d4c30f99834af4941a77d1891491d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.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_off0000b46d.bin
cbd7153cfa4d3837756ada4893f0998b3c7fa612c1a0292eed4e173715c3470b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 5516 bytes
font_01_sfnt_off0000c725.bin
247d73454989e9c2cfd8b946ba6e5b3ce119d3ef0500f8570aaf2822c25280de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 10368 bytes

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