Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd00de2736fd8b42…

MALICIOUS

PDF

51.7 KB Created: 2020-08-29 03:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68e6a067457913db0c575a4fbc86dddd SHA-1: e077b7f7559afbc211bfc30f090e84bff045f5ec SHA-256: bd00de2736fd8b42ce435aeb38e6ed2ab3f2e334b9e37c4bacda73b2d467ae2f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=atividades+com+numeros+em+ingles+pdf'. Additionally, another critical heuristic indicates a PDF link farm with 26 external links, many hosted on 'static.usrfiles.com'. The document body is heavily obfuscated but contains the same redirector URL. The primary attack pattern involves luring users to malicious infrastructure via embedded links.

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=atividades+com+numeros+em+ingles+pdf
    • https://static.usrfiles.com/ugd/b8c837_9b05c253910c4433b5a6a32592893e7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_47290f84890a4e0d8e292dde9666bc21.pdf
    • https://static.usrfiles.com/ugd/b8c837_a93371743a91452c8209e6108ff0f505.pdf
    • https://static.usrfiles.com/ugd/b8c837_0db1f00b79c2431a8e8f83ebf3afcfaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b386d4fea1f4f8880ee482204dfd440.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/67930997565.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/faxuteturakogis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/xuwamirixunosedukelepomi.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf754ad8e78246df8fccd1dcdfbb113d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1123d16fb5c3423fabb5776607bda751.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3a3acd1f15404a9c940703016500d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1f893424f6f45a6bf6d60411436a869.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e1b253cbb1f4a0d8a0cbfac212b163b.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058fb.bin
5221c04decd989104cda2afbeb667944b313331cdf1bfcfd3f1877fb402a4242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58FB 5408 bytes
font_01_sfnt_off00006b3e.bin
d986bc4f9bc36c17e04f2cc7da5a5b1ef1ed396aedebfb8118b1389354925da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3E 2080 bytes
font_02_sfnt_off000074d6.bin
dc9065a4e6072355010f17c2f482e8f824e1b1c7fc22ff1277b7635ab88c39b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D6 12388 bytes
font_03_sfnt_off00009ab4.bin
2e1aaa07843265da49cf1bedd111b3019027647b6eabebadeb7e0b27c4f87548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB4 16548 bytes
font_04_sfnt_off0000b16e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 4324 bytes

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