Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe456cb1ac05b35…

MALICIOUS

PDF

48.3 KB Created: 2020-07-14 01:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59387b9a2a87ead53ac13b1e3f7a282b SHA-1: edbb4eb2ae65b26cba3f444d35df878aae93ff93 SHA-256: bfe456cb1ac05b35d65fe0d970f5ced450de3741ab3b4234e1637bdb99839aed
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, suggesting an attempt to game search engines or distribute malicious links broadly. The presence of a 'download button' heuristic further supports a lure-based attack. The primary malicious IOC is the redirector URL, which is likely the entry point for a subsequent stage of the attack.

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.cc/wb?keyword=design%20builder%20user%20manual
    • http://files.johb.org/uploads/1/3/1/4/131438427/xudalimefu.pdf
    • http://files.schoolofmythsanddreams.com/uploads/1/3/1/4/131407565/widomutadejan.pdf
    • http://files.srmsmusic.com/uploads/1/3/0/7/130738565/9893736.pdf
    • http://files.fhcamd.org/uploads/1/3/1/6/131637034/5932877.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/61425470909.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/86116709737.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/39695303219.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/kixidisa.pdf
    • https://pimudan.files.wordpress.com/2020/07/gusidalunemakafaloj.pdf
    • https://nibajeni.files.wordpress.com/2020/06/75119003589.pdf
    • https://lurevaxi.files.wordpress.com/2020/07/gexivominexumukodiwowa.pdf
    • https://wajuzuk.files.wordpress.com/2020/07/43832748408.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/38225188555.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/76317526405.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/89665223948.pdf
    • https://cdn.shopify.com/s/files/1/0428/5726/7359/files/98391808709.pdf
    • https://cdn.shopify.com/s/files/1/0434/5643/0230/files/timogibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/pufuwokuxowabediti.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_off00007e80.bin
891a149efea15fe49515e55a1fc11e1a9eeb5bb3710129dfb0a68b2c97c52ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E80 4976 bytes
font_01_sfnt_off00008f37.bin
17f858ed3a447de34b72abb7e5a1599490a6b3cc9e563c9aa2efce9ae4c1139b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F37 10748 bytes