Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91d64b24819182a…

MALICIOUS

PDF

42.6 KB Created: 2020-08-29 04:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3bf7b1592a13e99b0f42e0f53ea6488 SHA-1: 7057c6f4f837a5745ff51165679ba04e24208ece SHA-256: b91d64b24819182af973a6a8cf6a9fc19b44ad8bab7b4709540a2785c1a04816
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised as a Toyota Rav4 workshop manual. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=toyota+rav4+workshop+manual
    • https://static.usrfiles.com/ugd/b8c837_8e2ceeff3cc145b5b535b7725b6ce195.pdf
    • https://static.usrfiles.com/ugd/b8c837_65107c90225148b7ab58151f91e311ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_38f41229ab5145edbf50adf1b5c48933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0463/0845/8661/files/tumba_mira_canion.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9603/files/wiwusemafexozojekapopidu.pdf
    • https://static.usrfiles.com/ugd/b8c837_283632828de34f7f9abc0ffae2dd97ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa6813c4b01d422fb9e46132c735b297.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/44085780320.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/commas_change_meaning_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1265/files/pdf_bestanden_samenvoegen_tot_1_bestand.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_off00006803.bin
63a3db21c67e41fbc3a83580067f123b07812fae84962a1b0037f1cb02afa2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 5416 bytes
font_01_sfnt_off00007a6a.bin
0dbae2cc87e7ac25d2b78e3da9fc46b34175a4ccb0dcffd28a167c27fd9d44e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10420 bytes

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