Malicious PDF — malware analysis report

Static analysis result for SHA-256 329863c3cd8a0da9…

MALICIOUS

PDF

47.8 KB Created: 2020-09-12 07:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31febe387bec31c866cb86ea389f76b3 SHA-1: a7c612852bd51c171940cab2d3384f7e8de0f46b SHA-256: 329863c3cd8a0da966f9a4f479fb245f5bfa4733a1d6b0c9d528d5430bdc42d7
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.club/wix?keyword=manual+bulevar+kralja+aleksandra+52`. Another critical heuristic indicates the PDF hosts a link farm, with many links pointing to `static.usrfiles.com`, suggesting an attempt to manipulate search engine results or distribute further malicious content. The document body contains garbled text but includes the suspicious URL and references to PDF files, reinforcing the link farm and redirection attack pattern.

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.club/wix?keyword=manual+bulevar+kralja+aleksandra+52
    • http://files.reimaginingwellness.com/uploads/1/3/1/4/131453620/10bf0509cb8c3.pdf
    • http://bowuxiv.comforthomeinspections.net/uploads/1/3/1/4/131405927/58577.pdf
    • https://static.usrfiles.com/ugd/26481d_98edd258503147069bfb5e71e9f740ab.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_71337af7e4db4842a2e3c22ff7638ec8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bda8bdaa3984470a4fde9f2de22f781.pdf
    • https://static.usrfiles.com/ugd/68ec51_0b0107781d4a43749e8689d5faff1bd3.pdf
    • https://static.usrfiles.com/ugd/5ad03d_bfadaa724386423aaf7628bda37ef37e.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_29df3a98d7c24e1f80b66ef92a856586.pdf
    • https://static.usrfiles.com/ugd/575363_9ceb641d39bf4612961829d6e5ae2d1d.pdf
    • https://static.usrfiles.com/ugd/cfa91a_749358aa5b1f44cf8d8a7a0dd7c029f7.pdf
    • https://static.usrfiles.com/ugd/b30cf0_5d6c0d4508a6464daa67f98169a50057.pdf
    • https://static.usrfiles.com/ugd/eb2f7d_b9c1e7e0b5984500995e164de52d0592.pdf
    • https://static.usrfiles.com/ugd/c81504_9504b35e71dd4398a9caddb9a23a5bca.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_off0000764a.bin
d33ebb117d5aad72da4ac975cef16c0a0f2d32346e511801ea6b27bb68820d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 5420 bytes
font_01_sfnt_off000088e0.bin
94218342f1f4889caea3122f5491b39e169587323529df254ac6a7936033a765
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 13084 bytes