Malicious PDF — malware analysis report

Static analysis result for SHA-256 935b7e83a086ce70…

MALICIOUS

PDF

70.4 KB Created: 2020-08-13 00:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5013216e5727b1da9be478ec76e32b33 SHA-1: dd132db266d7e22ae8877ba33efdd784506804d2 SHA-256: 935b7e83a086ce70a4db6b9f687cb7b613b977769913ccf7e9afaa29e15e5e2d
120 Risk Score

Malware Insights

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

The PDF file exhibits malicious behavior through a high density of embedded external links, identified as a 'PDF SEO Link Farm'. One critical heuristic indicates these links lead to a known malicious redirector infrastructure. The document body contains text related to 'Qms clauses pdf' and mentions the authoring application 'wkhtmltopdf', suggesting a lure document. The primary attack pattern involves redirecting users through a chain of links, with the initial redirector pointing to a URL associated with malicious activity.

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/wb?keyword=qms%20clauses%20pdf
    • http://files.anneboring.com/uploads/1/3/1/3/131379980/0216f7b4.pdf
    • http://files.wyomingrawmilk.com/uploads/1/3/2/3/132303035/lotizeda.pdf
    • http://files.mortgagesmart.solutions/uploads/1/3/1/3/131398477/guwafebexogekik.pdf
    • http://files.nancytmassagetherapy.com/uploads/1/3/1/4/131483336/zomelet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/pelonenifofuwajejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/75594096193.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3381/files/orchestral_excerpts_for_flute.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/93116948495.pdf
    • https://cdn.shopify.com/s/files/1/0447/1917/7882/files/adenitis_cervical_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/39343576128.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/fewemujubufifuxoritimem.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7034/files/vipojujusumixejaleratojav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/67375762902.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/zutegubiwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/25118769124.pdf
    • https://cdn.shopify.com/s/files/1/0449/5107/7032/files/amaranto_propiedades_y_beneficios.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_off0000d75e.bin
1bb628b39604ddb5e0bc52030c79faf076c5c76d7cab28430653df9dd797d7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 5268 bytes
font_01_sfnt_off0000e939.bin
fac1512141ded46652562a3d91318cd793f9e79ef2c15ef17c17e0a0c7025803
pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10436 bytes