Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef2a532913fef87…

MALICIOUS

PDF

72.3 KB Created: 2020-08-31 03:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb91b7f6c5887248ff4a0fa01f57059e SHA-1: d93ad901c5be2d40b6bcc304e1f478edd02153dc SHA-256: aef2a532913fef87ba35032b73250e0dabe169bf0e4e953e79e3eadc310f3ff3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This suggests the primary goal is to redirect the user to a malicious site, likely for further exploitation or credential harvesting. The ML classifier also 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=pathfinder+holy+gun
    • https://static.usrfiles.com/ugd/ea9bdf_50ae06303cf64c54a960429f4fa79a65.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_89ee5edd962e443198cc2d134073bb4b.pdf
    • https://static.usrfiles.com/ugd/7baf93_24074ddecea94ad78e683868c95b52be.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/cheek_cell_lab_report_results.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/99568509821.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1277/files/42490674699.pdf
    • https://static.usrfiles.com/ugd/784815_6be87f3eb97d4c00bbaac60ce5bb58c3.pdf
    • https://static.usrfiles.com/ugd/ee4a13_2a6282c4f1474e2395ea9f30dd945922.pdf
    • https://static.usrfiles.com/ugd/b8c837_05f288aff3d64d7496fe0bdac36ce92d.pdf
    • https://static.usrfiles.com/ugd/804ff6_2750783852c04ecaa7a79e47539384e8.pdf
    • https://static.usrfiles.com/ugd/0cd019_e8cbbb2342d543f78be7b9b10d60c7c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f344bbd63c14397ab3ea4d46e266329.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_off0000de85.bin
5a3bc981045187f9636450b1820f30b37894c43c12c840963aa5b9e3e3c58ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 5096 bytes
font_01_sfnt_off0000efd4.bin
1032d7da0a46774e1d7354befd4c87fd5a5178d3ba9e77e4749986506980b9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 10844 bytes

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