Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc21cc55fbdb9e89…

MALICIOUS

PDF

45.1 KB Created: 2020-08-14 20:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb459d4ccf3066889edadd770c85afb4 SHA-1: d849b424a164672769c0ce9d2dc893c3e01056c8 SHA-256: fc21cc55fbdb9e89c76c6e5f52ffaa7d50b3372db5ed5579e52e4ec1a6794db8
130 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm designed for SEO manipulation or to host malicious content. The presence of a 'download button' heuristic further supports the lure. The primary malicious URL, https://ttraff.ru/wb?keyword=word%20to%20pdf%20convert%20candy, is identified as a redirector to potentially malicious infrastructure.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=word%20to%20pdf%20convert%20candy
    • http://files.butchsmetalimages.com/uploads/1/3/0/7/130776350/duzosikukaxejek-xikogojurab-tawezuniwos-palezexawajij.pdf
    • http://files.wrigg.org/uploads/1/3/2/6/132695445/6562426.pdf
    • http://wedofowob.jafleur.com/uploads/1/3/2/7/132740373/nusegegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1060/4705/files/1889809466.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/xurejipivi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0201/8467/files/biographies_of_famous_personalities.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/26835002321.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/39589710657.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/31723599267.pdf
    • https://cdn.shopify.com/s/files/1/0435/5755/2277/files/string_comparison_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/29714605245.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/lokazugivizi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/69322856924.pdf
    • https://cdn.shopify.com/s/files/1/0437/2889/6161/files/21653001798.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/da_form_31.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db5.bin
3a7ca0ff02a3ced7469e8a4832e157745f64dbef0a8a3f77457958ed94cbe3c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 5116 bytes
font_01_sfnt_off00006f45.bin
875bdb15e3de8974a189c50760c1365a73cc0688e1f63d2171cd400f435ff795
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F45 10288 bytes
font_02_sfnt_off000092b8.bin
9d161d6e34f835aff196e226d852edde4d65b072a4902c32411b177d8c29261e
pdf-font-stream PDF embedded font (sfnt) at offset 0x92B8 16076 bytes