Malicious PDF — malware analysis report

Static analysis result for SHA-256 250b2fcf04c5664f…

MALICIOUS

PDF

45.2 KB Created: 2020-07-10 12:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70244bedfc3577b0f80f8447e1472f9 SHA-1: 483c9c51557ec865c530ef42b6fc660faf764505 SHA-256: 250b2fcf04c5664f9c2bf141057de9badec6b814bd9a2a1a4682e2573ed4eded
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wb?keyword=kierkegaard%20present%20age%20pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=kierkegaard%20present%20age%20pdf
    • http://files.anseasternwashington.org/uploads/1/3/1/4/131453249/vezag-sarabojid-tufudedafikum-xenipelamu.pdf
    • http://files.evandusenportfolio.com/uploads/1/3/2/6/132682335/0c046fe2cca4d00.pdf
    • http://files.canvasofthemind.org/uploads/1/3/1/4/131407823/5205868.pdf
    • http://files.fathomworx.com/uploads/1/3/0/9/130969887/d13a310b25.pdf
    • http://files.andy-buchan.co.uk/uploads/1/3/0/8/130874513/jisade.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://files.ukyorthoresidency.com/uploads/1/3/2/3/132302892/99a02991.pdf
    • http://files.midamericayouthrugby.org/uploads/1/3/0/8/130874575/vodatumiv.pdf
    • http://files.nanrubin.net/uploads/1/3/1/1/131164095/78144c98d018c.pdf
    • http://files.restorativeintegration.com/uploads/1/3/1/4/131408537/3711713.pdf
    • https://pezelid.files.wordpress.com/2020/06/29074371103.pdf
    • https://guzolegevaxa.files.wordpress.com/2020/07/1245383691.pdf
    • https://xisipitojeg.files.wordpress.com/2020/07/remafetipuv.pdf
    • https://sewekomebugi.files.wordpress.com/2020/06/12667310613.pdf
    • https://sozerowefi.files.wordpress.com/2020/06/ponuwosalikonokojoderod.pdf
    • https://takijavovasi439113950.files.wordpress.com/2020/06/75986385892.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.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_off00007517.bin
5f79874b65b0a074c1967a50435115a706e591c805287748219aec4b169bff7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7517 4888 bytes
font_01_sfnt_off000085bd.bin
d3c18d05fbd0333ee0e2b745237295660b2f37a17ec70ad6e3e66515a64c8756
pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 9972 bytes