Malicious PDF — malware analysis report

Static analysis result for SHA-256 20685c151d9980ad…

MALICIOUS

PDF

44.7 KB Created: 2020-09-01 20:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6316850fa43b28f711d6904322f08eb SHA-1: ae196ff92f0fd7db9f6cb92c45162bce0eb8b822 SHA-256: 20685c151d9980ad3c17f5e5379a6f08335c5855aa49a2ab92780c925f9e08f8
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to engineering drawings and dimensions, likely serving as a lure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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.cc/wix?keyword=engineering+drawing+sheet+dimensions
    • https://static.usrfiles.com/ugd/76de1a_6adadf38570742f59d9be8e259d3399d.pdf
    • https://static.usrfiles.com/ugd/76156b_203e9d52a5e3432ca89c484f5fae1b5d.pdf
    • https://static.usrfiles.com/ugd/47b1e8_87c85498ff1e454b92448557e8549ab8.pdf
    • https://static.usrfiles.com/ugd/1813b3_c489ce6bdf03423281db5757c4d384cd.pdf
    • https://static.usrfiles.com/ugd/c63dba_4c38d317120a4ceeac069be4a0822d36.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_79780035e4d94321a48ad20ac9a531fa.pdf
    • https://static.usrfiles.com/ugd/7ff653_c444a4512bd2446690599481975f40c3.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_238cf9add4724687a66681228a34d863.pdf
    • https://static.usrfiles.com/ugd/7198c1_9358dcb3aa4642f8ad0cb345004f18e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3a080b41d5e40d0879a4276ef87e7a5.pdf
    • https://static.usrfiles.com/ugd/e02969_4144abf010c54c1ebd6cdc8ebe00978c.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://static.usrfiles.com/ugd/dc98cc_a0c9e161d0504eab9664ed51daceaa0d.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_b985853ee77c4642ba9f649d24090a60.pdf
    • https://static.usrfiles.com/ugd/3aee12_7236c8d501e44616ae9179d28ba50d13.pdf
    • https://cdn.shopify.com/s/files/1/0434/3277/1750/files/kabimadukanovetebula.pdf
    • https://cdn.shopify.com/s/files/1/0434/4053/7750/files/o_que__entropia.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9571/files/76200433155.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_off00006e0b.bin
b8be12609ce2296ff2a4e2440362944e95344f73d5210db297b35bd55e470b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0B 5256 bytes
font_01_sfnt_off00007fd9.bin
f9e610237494ac599b5e3d1f66d3b070a6308f423b45e4226a7c5ec161abcbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD9 10832 bytes

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