Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3d82b6141a8b47…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 07:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbea5b5deff8c8d87f13a81113e6402a SHA-1: 9830ba3213e2bf63adfc0657bcf22fca1824c730 SHA-256: cb3d82b6141a8b471210d1fedf5717ddba58c056d0fc85fb18dad905e39ce9b9
152 Risk Score

Malware Insights

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

The PDF file contains a link that points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a schematic diagram, suggesting a lure to entice users to click the malicious link. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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.me/wix?keyword=hannstar+j+mv-4+schematic+diagram
    • https://static.usrfiles.com/ugd/64f9d2_2e0986e2cb724c92b945f537a05082d9.pdf
    • https://static.usrfiles.com/ugd/cac9e4_3051f5393f1544c38e3e1b96090689d9.pdf
    • https://static.usrfiles.com/ugd/b5472a_022d613f22ef4daf97ab02c0a7de6aa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_27b9f03b846f48aaba7ca3a38fd34522.pdf
    • https://static.usrfiles.com/ugd/b8c837_25db1d548a5849b9814507fd727b93b6.pdf
    • https://static.usrfiles.com/ugd/ec0c41_384baa8aa5204d53b28e6fa6b334e345.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
    • https://static.usrfiles.com/ugd/4c1554_c35b290fccb3410d842d4eec7568713b.pdf
    • https://static.usrfiles.com/ugd/b8c837_96ef957819994517b88d579f13cb03cc.pdf
    • https://static.usrfiles.com/ugd/e4ff69_22cd3ad5f22a4e56850e6ae83735c130.pdf
    • https://static.usrfiles.com/ugd/87a178_d53b298ba17f4d6b817c4374a44c535c.pdf
    • https://static.usrfiles.com/ugd/b88e3d_bc05d66a33aa4b698e8ed29533544981.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_off0000663e.bin
b9c0406d0b55d0255552478894706df9d12a22aa871e74aeb46c2ddc1f0dad22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 5540 bytes
font_01_sfnt_off000078f6.bin
c135021ac73da668779413348215fa79beba3b73c78cc990514793f8f93f6b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F6 10376 bytes

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