Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4826bff72b9318…

MALICIOUS

PDF

43.0 KB Created: 2020-07-18 17:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3cda1e7c92aa45be8e595f69d258685 SHA-1: 875109b26f2b03a711a2344e38e7ae85a3c21f12 SHA-256: 8c4826bff72b9318f84c7feb1a8d8a139997c7cb23ff6e7aeba23adfb25a577e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links designed to appear as SEO-optimized content. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure through deceptive links.

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.ru/wb?keyword=dupont%20manual%20high%20school%20louisville%20ky%20football
    • http://files.comforttrainer.net/uploads/1/3/2/6/132681002/4312007.pdf
    • http://files.newcastlenetworkinggroup.com/uploads/1/3/0/8/130813887/90ec99c3.pdf
    • http://files.catrionayoga.com/uploads/1/3/0/7/130775241/7243491.pdf
    • https://gutekod.files.wordpress.com/2020/07/tolevopomuxaraja.pdf
    • https://jekiwex.files.wordpress.com/2020/06/33273374672.pdf
    • https://nabukeb.files.wordpress.com/2020/06/15426559099.pdf
    • https://nedetepu.files.wordpress.com/2020/07/tafiluxezijasidenogu.pdf
    • https://jovumisev.files.wordpress.com/2020/07/51154166273.pdf
    • https://gakazorex.files.wordpress.com/2020/07/33792619801.pdf
    • https://fikuravere.files.wordpress.com/2020/06/rorirowofor.pdf
    • https://tasebetov.files.wordpress.com/2020/07/fipabolipo.pdf
    • https://sorudaxib.files.wordpress.com/2020/07/wadunonexupegipileti.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/desoxijuwawuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/powopasotekemitifel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/399606343.pdf
    • https://cdn.shopify.com/s/files/1/0432/5444/8286/files/16989115762.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/zimeburireperokoriniv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/26207254187.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/66128302277.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_off000068eb.bin
0d2d1b704e810cc757423c40bb4a2f7954ce6103b95db5357b10c50ed449e1f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 5580 bytes
font_01_sfnt_off00007bcb.bin
36d57108d670e63e30434a9617807631fcf530b12d77fb946bd956ca2a64562a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCB 10068 bytes