Malicious PDF — malware analysis report

Static analysis result for SHA-256 c682745d4cb1cdfa…

MALICIOUS

PDF

46.7 KB Created: 2020-07-09 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adac126d15bddd42d08710b06b08264d SHA-1: 6b1fd0f57bb15b7f913a982a2a5e8bc6ae732d68 SHA-256: c682745d4cb1cdfac3c0ea14572ec2d7a46caeb34b7402d294ab0d97c9523361
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs, such as 'https://ttraff.ru/wb?keyword=red%20hat%20linux%20commands%20for%20beginners%20pdf', are indicative of SEO spam or a phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of suspicious links points to a delivery mechanism focused on external redirection.

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=red%20hat%20linux%20commands%20for%20beginners%20pdf
    • http://files.chinookwritingandjournaling.com/uploads/1/3/1/4/131454264/nebebebevap-vutugafe.pdf
    • http://files.levelsofminimalism.com/uploads/1/3/1/6/131606395/xuxijojigezab.pdf
    • http://files.thegoldharvestmusic.com/uploads/1/3/0/9/130969986/251713.pdf
    • http://files.pepeandnixi.com/uploads/1/3/0/7/130775131/9d89bebbec220ec.pdf
    • http://files.bellamymassagetherapykelowna.com/uploads/1/3/1/4/131437832/3504616.pdf
    • http://files.davidsmassey.com/uploads/1/3/1/6/131607023/zibifulamuti_fonilefobapiweg_xovorazi_kiletodofemigeg.pdf
    • http://files.kulimushibarongozi.com/uploads/1/3/0/9/130969459/b7e64d4c4.pdf
    • http://files.bigtundraenterprisesprofessionalheadtaillightservice.com/uploads/1/3/1/1/131163932/00265163286.pdf
    • http://files.nervouscurtains.com/uploads/1/3/0/8/130814284/67009f2e.pdf
    • https://juwurel.files.wordpress.com/2020/07/80437249631.pdf
    • https://gizesovaker.files.wordpress.com/2020/06/bosawiwilodadelovi.pdf
    • https://babaretoluti.files.wordpress.com/2020/06/gunifosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.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_off00006cb1.bin
85d9f22a1666b23b70028607606b370496d3527c9c8908d2ee1dd6997543b690
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB1 5668 bytes
font_01_sfnt_off00007fc0.bin
192ae700a447404ab548116f82a27c84f537005746a9d4feb928088f029e8b4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC0 14852 bytes