Malicious PDF — malware analysis report

Static analysis result for SHA-256 9058d3e38adc1b5b…

MALICIOUS

PDF

41.1 KB Created: 2020-09-02 01:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abc1cf9e7bfdfdc140e442e884d9ad9 SHA-1: d42f38e417a9f5be951e1e84622d567449a5354c SHA-256: 9058d3e38adc1b5b7bce9d8fbd8d40dacb7c77577e83df5289bf8874a63ebde1
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a novel PDF download. The ML classifier strongly indicates maliciousness, and the PDF structure includes a mass of external links, many pointing to a link farm. The primary malicious URL is https://ttraff.cc/wix?keyword=a+wrinkle+in+time+novel+pdf, which is likely used to redirect users to further malicious 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.cc/wix?keyword=a+wrinkle+in+time+novel+pdf
    • https://static.usrfiles.com/ugd/b8c837_ed90f2a3be8542cda28f486d9cbf2f16.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e24c6fa2c754dc99b2900516f28e6c8.pdf
    • https://static.usrfiles.com/ugd/217b8a_781d05bdd8fb4208bf77aa1520ef16da.pdf
    • https://static.usrfiles.com/ugd/97368a_73cd7c724a42428788d167ba3aaf2e89.pdf
    • https://static.usrfiles.com/ugd/bae363_de5ce1bbacdd4e049b63b5dd58ba3288.pdf
    • https://static.usrfiles.com/ugd/83b1b3_e050f8cf701e4d41850dac61a759262a.pdf
    • https://static.usrfiles.com/ugd/63022f_418741e29a164fdcb404afa126cef251.pdf
    • https://static.usrfiles.com/ugd/f84671_9485f332888847128414ffe1b9003304.pdf
    • https://static.usrfiles.com/ugd/0e6328_1f5d68671b9e44a7b31c10869402e5fc.pdf
    • https://static.usrfiles.com/ugd/764aaa_8b40d78dc1344757b1cc13fd7272499e.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_off0000630f.bin
e1a45b85c5037e034e5c14258a93e6827eac7fead0b77ee1f33fc26182603527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 5004 bytes
font_01_sfnt_off0000741d.bin
8e4eba4f495623b1e54c3306177a9a447a539232727a47681dd960f5acc2295d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 10312 bytes

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