Malicious PDF — malware analysis report

Static analysis result for SHA-256 42815cbbffa860bf…

MALICIOUS

PDF

35.8 KB Created: 2020-08-15 21:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9ef636a0c55add5523c057c434aecc3 SHA-1: abbf42de10ef6b0bb243c3af7fcd409d658e20fc SHA-256: 42815cbbffa860bf1dc4ef9e78568f35f0b4d1b0dbf15632c2534ae4ad28ccda
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 designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the redirector, suggesting the primary purpose is to lure the user to a malicious site.

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=knockin%20on%20heaven
    • http://regese.capristo-usa.net/uploads/1/3/1/3/131398091/jasorejuzibemig-vanefodej-xenuman.pdf
    • http://files.canalvoyagewebradio.com/uploads/1/3/0/8/130814258/4e11bcae.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7596/files/14693983930.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/biblio_scientifique.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/exemple_d_avant_propos_d_un_rapport_de_stage.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/jubuzoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/44045472475.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/gapewopemesan.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/2227479281.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/mutosafivibubuvetul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/lifenigederuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/79644169504.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7269/files/89439311543.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_off00004dd5.bin
419e7315def59e0d665c5dc064cce5653899a0cd0fee3557c02cd89606f4e0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD5 5372 bytes
font_01_sfnt_off00006013.bin
1e0aabf014b1cce746db511fc5a072828ca70f8cb32db04eb80603ccf94bb5bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 10104 bytes

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