Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ad374f1d546427…

MALICIOUS

PDF

40.3 KB Created: 2020-08-30 07:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c5a6b9ed96c511fb7ae41fad9605e9 SHA-1: 2898f5929bb8ace775a067a30034337c013cd3ee SHA-256: b8ad374f1d546427a3cadd44d8d7f517d609623c752edabf49474adb21ee3a85
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, `https://ttraff.club/wix?keyword=thousand+foot+krutch+free+mp3+download`, which is flagged as malicious. The document also hosts a large number of external PDF links, many pointing to `static.usrfiles.com`, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, and the overall structure points to a lure for downloading further 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.club/wix?keyword=thousand+foot+krutch+free+mp3+download
    • https://cdn.shopify.com/s/files/1/0431/6558/1469/files/91188457732.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/29676459201.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/uses_of_bitter_leaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab2b05f74c414cb7b4fb22603b6603d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad0c5470d84547a3b459b64627caf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7a06a31749b4e9e8983b609aa762230.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfc2266b12354d6bb593e96dbaea740c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b665a348b6144919aacb5c9f5cfc3fc8.pdf
    • https://static.usrfiles.com/ugd/b5472a_b9fe71d347ec470bb2d66bb2ce42a7d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b70d8bed95487c88a558d717dc91f5.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_off00005cd6.bin
4522cf443a2c1a261b0828a88226f6a23961e880a9bfa06ba0e220148bd5f12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 5664 bytes
font_01_sfnt_off00006ffb.bin
71069d27628104d440509c97780e725742dcdb7d0db65190b026f0d55ee5a884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 11052 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.