Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8800d5858682d46…

MALICIOUS

PDF

42.7 KB Created: 2020-07-09 04:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0fd539d0a2ef1255afa7aab69cadd3a SHA-1: c4c26998afa52268dff5f07f1d0f4c4cdf03eb20 SHA-256: a8800d5858682d465c4cf2e610c8a92f13ac2eec60973748d64683cbdf9d95fb
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to domains that appear to be part of a link farm. The primary link redirects to a URL containing 'fillable resume templates pdf', suggesting a lure to trick users into clicking. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links confirms malicious intent.

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.com/wb?keyword=fillable%20resume%20templates%20pdf
    • http://files.moodypig.com/uploads/1/3/1/1/131163705/jasatap.pdf
    • http://files.jobarber.com/uploads/1/3/1/3/131383977/30160f06df5eb.pdf
    • http://files.u-fit.org/uploads/1/3/2/6/132681954/vilomejolagevizesaki.pdf
    • http://files.wesleymerced.org/uploads/1/3/1/8/131871785/40b69e0782f73b1.pdf
    • http://files.sanctuaryofhoperetreat.org/uploads/1/3/1/6/131606819/5901105.pdf
    • http://files.minilivestock.com/uploads/1/3/2/7/132740415/38a223c.pdf
    • http://files.bonsaireading.co.uk/uploads/1/3/1/3/131384208/37c10a.pdf
    • http://files.landsendschoolofart.co.uk/uploads/1/3/1/8/131856770/0b18c1bf2108.pdf
    • http://files.marciabartusiak.com/uploads/1/3/2/6/132695467/4266048.pdf
    • http://files.thomas-flores.com/uploads/1/3/1/1/131163910/sofobinorodenezafas.pdf
    • https://fataluvebuf.files.wordpress.com/2020/07/29580497329.pdf
    • https://mozovubebu.files.wordpress.com/2020/07/lasexibatefulujituk.pdf
    • https://xisezuw.files.wordpress.com/2020/07/93109604349.pdf
    • https://sixupijemiw.files.wordpress.com/2020/06/8668844777.pdf
    • https://nojowijede.files.wordpress.com/2020/06/58665651441.pdf
    • https://zafepib.files.wordpress.com/2020/06/11967259866.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62042090741.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61047377128.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.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_off000060dd.bin
9e930a7addac52418864887927ca661210cf52205186850714eea3b38f618a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DD 2828 bytes
font_01_sfnt_off00006ad8.bin
6e3b365782f3726a46e2d3520a5c9e49834fba6d203cba31c692c5d3eec45c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD8 4948 bytes
font_02_sfnt_off00007b9d.bin
d05b6265e96b48fb73db6810dc878245aebe8c55a1dce7c03832cb7ae6f4602f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9D 9832 bytes