Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4568eade9e9ef9…

MALICIOUS

PDF

41.3 KB Created: 2020-07-31 22:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a978e03b64f22111c388e39307f782eb SHA-1: 7aee5669c65910a4cb09fa1d4c2cd6a0690ae742 SHA-256: 1b4568eade9e9ef988edcfae4c53ce1a4c8aaa52382611324f216c49c209cdb3
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=briggs+and+stratton+carburetor, which is likely used to redirect users to malicious content. The document body contains obfuscated text and embedded URLs, further supporting the 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.ru/pify?keyword=briggs+and+stratton+carburetor
    • http://files.guildfordsongfest.com/uploads/1/3/0/7/130740256/setegonipejor.pdf
    • http://files.bensawyermusic.co.uk/uploads/1/3/2/7/132740218/kelupotamevivok.pdf
    • http://files.jameschristianimagery.com/uploads/1/3/2/6/132695519/wezogedakanijep_xuzofosegi_bumilonoxuwimi_dujedi.pdf
    • http://files.moderndayparablesrcf.com/uploads/1/3/0/7/130740049/zadigapuvunib-sejazole.pdf
    • http://files.paulusvestment.com/uploads/1/3/2/6/132682934/2461564.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/wopusenuxawuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2008/3612/files/botovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/zepanamejobitiwebiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/46039929636.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/kuwomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/25794816907.pdf
    • https://cdn.shopify.com/s/files/1/0438/8270/9160/files/2892288327.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0428/4963/2415/files/viseriworuminu.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_off000063a5.bin
b13941bfe14d6601528f42384aa9e244cf5cf8b6b907decd0de1570048acbe80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A5 5264 bytes
font_01_sfnt_off00007595.bin
9b0c95afdc04486a8ba843cf2f65d31a0b6943679173257aeea8c6a5cd3a06ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7595 10212 bytes

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