Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e6237940367ebf…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 03:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef56ab32c07876efbb38ddc1c861d901 SHA-1: 669537d0cfbfd3d9e8ce639ba84bcbfa57c82927 SHA-256: 27e6237940367ebf3812c82c8fc9cac30a5012f5542407a0008898b6a743c2c6
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=e36+repair+manual'. Additionally, it hosts a large number of external PDF links, many pointing to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, reinforcing the redirection and link farm findings.

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=e36+repair+manual
    • https://static.usrfiles.com/ugd/b8c837_a21a8a102c63441cb91f9197f9880daf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b54901a16fa140ae866ad1d87633440b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f2ddb608771465eb769970733923c65.pdf
    • https://static.usrfiles.com/ugd/b8c837_56e2a992cd1648e79a269c6445757132.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4c76b55ed074d8d961342a8d845414e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4d157925e36458f937b21fb2563219e.pdf
    • https://static.usrfiles.com/ugd/b8c837_317bc0550ebd4c2b950a42dea582c972.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d400996ab0e4c05ba85024b67e10cf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_885c92d5ba4a4cb8bff8f0cc4e663f9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_89cc82cb06bd47df83cc7842ad9e5c91.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_off00006d68.bin
a0f026ccbec652e6c41b35983f073f7ba90ebebc1ea0a2ed2ddd50c0ae2f9d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D68 5060 bytes
font_01_sfnt_off00007e7c.bin
d1464c1a24f28197c8abd22f436610a315882b48f75dfa78bf9bc8dd86073ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7C 13636 bytes

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