Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae51cbfec24619d…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 12:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa706da298dc0564fc4a1c9f7c60e9d SHA-1: eeb96fca7e9fff718f227e318fdd7e9ad0f2e28c SHA-256: 1ae51cbfec24619d4df753f62d6b88b6c86a9cccb51e1fed1804a503b9d7f104
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a source for free papercraft templates. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent. The document body, though heavily obfuscated, contains the URL that is likely used for the redirection. The presence of numerous external links, as noted by PDF_SEO_LINK_FARM, suggests a link farm or SEO poisoning tactic to distribute the 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.com/wix?keyword=free+papercraft+templates
    • https://static.usrfiles.com/ugd/b8c837_dd23055f604643b0b8626aa6c0d34ced.pdf
    • https://static.usrfiles.com/ugd/b8c837_463de93d2f4c4289be6300a96b299f5c.pdf
    • https://static.usrfiles.com/ugd/7c3584_f5faa0c6f4ed4d839e23f032b5319a3f.pdf
    • https://static.usrfiles.com/ugd/ee4a13_11a9d0234c4f4d9b87ee885e10bcca19.pdf
    • https://static.usrfiles.com/ugd/906e9f_c50dfe8b35ed456082d3f084ac5564c3.pdf
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/sikut.pdf
    • https://cdn.shopify.com/s/files/1/0440/0853/8262/files/tony_robbins_business_mastery_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/70628506060.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/fajuf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df28bd05ccb41a399151a157c93f8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_47286e98083c41f7bc5ad993dbc5cc57.pdf
    • https://static.usrfiles.com/ugd/0dd040_6534b60609344373918293a44bda79de.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_off00005de0.bin
2ab17829be48b0aa5262620517f4875c3bd2febe7f57c2657c9961b113d18bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE0 5116 bytes
font_01_sfnt_off00006f37.bin
895c867ab66d056b3cdc044977d853e7fbe18135854a55b1daccfb51f4ebd35a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 10380 bytes