Malicious PDF — malware analysis report

Static analysis result for SHA-256 21acd1041efa1b7e…

MALICIOUS

PDF

60.7 KB Created: 2020-07-17 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77a7b939e78a3ac0184a3359465b79cf SHA-1: b522d310385830d1486f327fae11c8b55157e14b SHA-256: 21acd1041efa1b7ef8a8c23852bd41d59beee84c5bc7399ae82adcd4fce97a27
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=rubberized%20concrete%20pdf'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a social engineering attempt to drive traffic to potentially malicious sites.

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.cc/wb?keyword=rubberized%20concrete%20pdf
    • http://files.leelakelleybodywork.com/uploads/1/3/1/8/131856119/zatudafikaxejelerasi.pdf
    • http://files.kintsugioxford.com/uploads/1/3/1/6/131606349/24960c01a.pdf
    • http://files.captivatingcriminalitynetwork.net/uploads/1/3/2/6/132695478/nugasizewavagopasule.pdf
    • http://files.candiceblount.com/uploads/1/3/2/6/132683070/5972145.pdf
    • https://vuxemedobu.files.wordpress.com/2020/06/77173415718.pdf
    • https://digogaba.files.wordpress.com/2020/07/16673778560.pdf
    • https://gefulinosug650871460.files.wordpress.com/2020/07/naxatiniwozawazaze.pdf
    • https://gabotisiv.files.wordpress.com/2020/07/78572637534.pdf
    • https://vojezowodoti.files.wordpress.com/2020/07/zapej.pdf
    • https://didejemaba.files.wordpress.com/2020/06/sokolanivegezubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/46738778793.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/vutomewid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/gixagivojodoseboruduf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/sitijaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/54285857471.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/xibodowivanerumogox.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/fofuvawurap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/48145297141.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_off0000b1d1.bin
b8ebc002c6fbd9cbf1b20d06b8c9d29e02cc5ec43f8b87500bf6e531496f027b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 4808 bytes
font_01_sfnt_off0000c239.bin
a0b83b0d1ea63abe5c71ab701fe825fdd2ba5b993bd4b3b9e628761a53a5f5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 10276 bytes

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