Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f82b4cf05aa8e…

MALICIOUS

PDF

67.8 KB Created: 2020-09-01 11:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed58509c13ae38486b2081e241d39ef SHA-1: c8dbff96c19cec7f834fed5558ba7b9a49f5fe28 SHA-256: 344f82b4cf05aa8e9b00696ce225a726c35e3c0339e60dc61a340ed1a274500b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Japanese food vocabulary worksheets' and a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly flags this PDF as malicious, suggesting an attempt to redirect users to harmful 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.com/wix?keyword=japanese+food+vocabulary+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_58cefc3aef284e358fb09f3a1017fe3c.pdf
    • https://static.usrfiles.com/ugd/76156b_b640e588506e41969b6009f48553828e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e363015ff504085a3de576f5df0ec33.pdf
    • https://static.usrfiles.com/ugd/40512e_4c26db8f42f241029c9372a8090e3243.pdf
    • https://static.usrfiles.com/ugd/432b07_c53313f1a3cb4e97a8cc9417b7ef4a15.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_1527cc11b89044d09054d3d8f9776649.pdf
    • https://static.usrfiles.com/ugd/fafc38_93e303203d2d4454a4e871cb64ebddd4.pdf
    • https://static.usrfiles.com/ugd/fd3290_24c143eac4aa4c5d81327ddb19b7a74e.pdf
    • https://static.usrfiles.com/ugd/8a419d_71508a35e1df43979883bbd1744f23ea.pdf
    • https://static.usrfiles.com/ugd/29c71c_cc4a48c0e2834d42ae8f153e57afd0f8.pdf
    • https://static.usrfiles.com/ugd/6cfc61_0333a4aac39545ae89231b2832e888e9.pdf
    • https://static.usrfiles.com/ugd/1decf9_15e9fe1d45e74002a2117a31f0b5c49e.pdf
    • https://static.usrfiles.com/ugd/de65f7_9929f5cc9f47479291b1e87ca3cd0f39.pdf
    • https://static.usrfiles.com/ugd/74c34a_d50a5110867945f1943ea70b0f1597e2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097c7.bin
5c2e556b67300271e247f712f67807b15363061e6393fceea90e45d319e9b73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C7 11300 bytes
font_01_sfnt_off0000bd57.bin
9ea707e43ac79d3398c1ae7f2634d1348ad886fbabd80150c585d98576fa24a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD57 5524 bytes
font_02_sfnt_off0000d02d.bin
174ea311068f4260bd4da36d949921a28a638b57ac2e09599cd035ec5c7e875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10304 bytes
font_03_sfnt_off0000f35e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 4324 bytes

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