Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f1966db099e712…

MALICIOUS

PDF

39.6 KB Created: 2020-07-20 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70db3d107c10f73502ebbcf2c3d1096f SHA-1: 2651ffe5d5c8eba2e33225eb60b2147437b4b13c SHA-256: c9f1966db099e712cd4cefb61095aa7e6cf74971dba12c44736a81f3b31d94d2
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one critical heuristic firing indicating a malicious redirector. Another critical heuristic identifies this as a PDF SEO link farm, suggesting the primary purpose is to drive traffic to external sites. The embedded URLs, such as https://ttraff.ru/wb?keyword=double%20number%20worksheets%20ks1, are likely part of this malicious infrastructure.

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=double%20number%20worksheets%20ks1
    • http://files.blackbullfrosterley.com/uploads/1/3/1/3/131398358/5828953.pdf
    • http://files.misswcourtroom.com/uploads/1/3/1/3/131383823/lekop-xugoligazi-fuzulabap-lupuwep.pdf
    • http://files.hutchbooks.com/uploads/1/3/1/4/131406841/cb37b3.pdf
    • http://files.moongoddessemporium.com/uploads/1/3/1/4/131438423/jibuti.pdf
    • http://files.moongoddessemporium.com/upload
    • https://kogovabazoro.files.wordpress.com/2020/07/vusid.pdf
    • https://jarawagodas.files.wordpress.com/2020/07/jajolure.pdf
    • https://waxizonuv.files.wordpress.com/2020/06/25064646353.pdf
    • https://delepozafejo.files.wordpress.com/2020/06/30222426106.pdf
    • https://mumovesutaj.files.wordpress.com/2020/06/kipufibafigazen.pdf
    • https://wazuxewimido.files.wordpress.com/2020/07/17293228475.pdf
    • https://tefuradimuva.files.wordpress.com/2020/07/34766158937.pdf
    • https://josotanemi.files.wordpress.com/2020/07/37791625172.pdf
    • https://bivuwid.files.wordpress.com/2020/06/93036722497.pdf
    • https://xeburov945496308.files.wordpress.com/2020/07/soledodegenexopozijun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/pevesokirokameken.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/66780638973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/52653138640.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/zakiremeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41697505155.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/wuvawazibilivopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/45023380193.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_off00005ee7.bin
d4d9d1b850db8d959eca3acd3e6beabe0bc34ff5ce55048dde6013c7a9b2b956
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE7 4896 bytes
font_01_sfnt_off00006f78.bin
a7d972217190823da4bc509f96ce37cd2210cad56b874933409451c58c4e99ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 9760 bytes