Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf6761ee04c73b7…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 15:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99276590b6dca3aba1c171d55f8efbe8 SHA-1: 8d8a7d1e0a48c202e29309a3d35bbefbc9a72a79 SHA-256: 1bf6761ee04c73b7523a75252f6e9af7036cb2c04e487a98339b1e4a4b49292c
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.com/pify?keyword=verbe+go+en+anglais+forme+n%25C3%25A9gative
    • http://files.xonoil.com/uploads/1/3/1/4/131438018/878331.pdf
    • http://files.cadellcabins.com/uploads/1/3/2/3/132302759/85463d.pdf
    • http://vakewi.baltodanofilms.com/uploads/1/3/0/7/130776418/2f21bdb4c.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/wovetodosajaxowemusu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/59668305611.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/xawidirejoxapiraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2090/files/82825495306.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/69794487007.pdf
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/ge_common_documentation_library.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/xituxoritonenuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/acceptable_quality_level.pdf
    • https://cdn.shopify.com/s/files/1/0435/5833/8715/files/zisatixenirago.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/vumikatibelasuxefur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kekiwimuzavenomudajelibo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059b7.bin
88ee1f1d3ddf0b5a85a1ed7f936df1dcae8dadd455e0377ada3ca1afa72f3565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 5396 bytes
font_01_sfnt_off00006bc0.bin
c6d6cdd9e0637f69ca42c189cd99bf0bfa40e73fd46de5fc5978b7cbb5d2d528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC0 11936 bytes
font_02_sfnt_off0000921c.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x921C 16084 bytes

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