Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9230296d140d80d…

MALICIOUS

PDF

42.0 KB Created: 2020-07-09 00:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f496e67014b875f2118f1d619eca35 SHA-1: fc01840b09e09b5e79a72cc3f76a406e800ab2b4 SHA-256: a9230296d140d80d60c99d72d6030c86403d628a445921156d58c111b90829c7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/wb?keyword=object%20oriented%20programming%20patterns%20pdf`. The document body, though malformed, also contains numerous URLs that appear to be part of this link farm. This suggests the primary purpose is to lure users to malicious sites, potentially for SEO poisoning or to serve 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.ru/wb?keyword=object%20oriented%20programming%20patterns%20pdf
    • http://files.youngstiling.co.uk/uploads/1/3/0/7/130739419/wosid.pdf
    • http://files.detroittaprep.com/uploads/1/3/0/7/130775371/xokiro.pdf
    • http://files.rsvpvolunteercaregivers.org/uploads/1/3/2/6/132681824/navate.pdf
    • http://files.structuredevelopmentnw.com/uploads/1/3/1/1/131163920/8182421.pdf
    • http://files.ninjamagik.com/uploads/1/3/0/8/130874629/jatupisejumelovavog.pdf
    • http://files.sanctuary-magazine.com/uploads/1/3/1/4/131407823/9778136.pdf
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdf
    • http://files.signingbabyexpress.com/uploads/1/3/1/3/131383889/3123619.pdf
    • http://files.caelart.com/uploads/1/3/1/8/131871829/1457611.pdf
    • https://jowotaxolog.files.wordpress.com/2020/06/tozesixoguzixemebulisaxu.pdf
    • https://vonubese.files.wordpress.com/2020/07/sibitumo.pdf
    • https://kiwuzuk.files.wordpress.com/2020/06/vijonegevupejivefo.pdf
    • https://filemukaxene293587401.files.wordpress.com/2020/07/18043161385.pdf
    • https://nexufig.files.wordpress.com/2020/06/51987438295.pdf
    • https://wibuvevi.files.wordpress.com/2020/07/54292401876.pdf
    • https://buzuboxovova.files.wordpress.com/2020/06/zamuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62042090741.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wonazonuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.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_off000066fd.bin
4f64b8a4f88f8bdabc5304da0a9c0c2b90ef0f7cf7f9ca2dbbafa1bba6c6af34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 5472 bytes
font_01_sfnt_off00007973.bin
4fe577532c11a08cefbd6adc52da7e370a98c4748867676f1959adcd66968fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7973 9828 bytes

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