Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe483b9d91b167ac…

MALICIOUS

PDF

42.9 KB Created: 2020-09-05 05:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f505ece49c62041a65dea24e7a2ca8 SHA-1: 3de286273f8fedb722014d0437a19394a3ca19e3 SHA-256: fe483b9d91b167ac820d336ec4aa85c05dad880529f58e19fcc3769e87bb05fe
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting a phishing or scam attempt. The primary malicious URL identified is https://ttraff.club/wix?keyword=ct+cerebral+angiography+report+template. The document body, though heavily obfuscated, contains text related to a report template, likely serving as a lure. The ML classifier 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.club/wix?keyword=ct+cerebral+angiography+report+template
    • https://static.usrfiles.com/ugd/51c472_ea78ee006c154804b9b0152387cdce5e.pdf
    • https://static.usrfiles.com/ugd/6116da_a9c39ff19c994544b05f07e5533a8421.pdf
    • https://static.usrfiles.com/ugd/9421c8_51d40d98f0f243adb7f588807f2f6138.pdf
    • https://static.usrfiles.com/ugd/73c254_365be75775914cb2ab303ac8c73c689e.pdf
    • https://static.usrfiles.com/ugd/b8c837_41ffc76705b449a68b205ae302f29177.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2232/files/41656181973.pdf
    • https://cdn.shopify.com/s/files/1/0432/7732/0352/files/sezogusojudugimudalokolom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/class_attendance_record_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/9443725736.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/kujaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/88005603075.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_off00006a18.bin
543de8465d5ed4efb77e71b7cb4f533e60356ccf761fab966d7fb02629870c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 5316 bytes
font_01_sfnt_off00007c08.bin
989ed4b0a4f18be3fad85d777d2727b4a7f570b2c392eed8cb51d76cf3186499		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 10376 bytes

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