Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d5c99f19bbdd9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 18:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba43569b9dc48e359de69d76deca7430 SHA-1: c337ed56a167feaae8d5a13b4e442e0cd1bc085a SHA-256: a44d5c99f19bbdd9046559da2ef4c274f1c89ac38c0ece04cb28a6bc731a9b29
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of external links. One of these links, 'https://ttraff.cc/wix?keyword=cruche+d+eau+croupie', points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to distribute malicious content or phish users by overwhelming them with links. 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.cc/wix?keyword=cruche+d+eau+croupie
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/59664041732.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/58781836561.pdf
    • https://cdn.shopify.com/s/files/1/0430/9185/3479/files/acromioclavicular_joint_separation_learning_radiology.pdf
    • https://static.usrfiles.com/ugd/b8c837_9eace22d32914984a2f7a99007a56742.pdf
    • https://static.usrfiles.com/ugd/b8c837_808dcbcd55bd42d580d2a6857c57554a.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/42986921629.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/29352314915.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa6b8dff86a4d399fb9527455677dd3.pdf
    • https://static.usrfiles.com/ugd/4d400c_17add2e8c833441090c66d5f0f18c093.pdf
    • https://static.usrfiles.com/ugd/b8c837_11a53feb3f1d4891977363a9b9ba0a44.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3eb8f7263154a14a9f727e1936c92c3.pdf
    • https://static.usrfiles.com/ugd/576447_3601fd0d937345d4b1cc878f72112f62.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_off0000659b.bin
29aea5f16931817532cfb97a157358adb1b0bb51c733acac7d30ac99254944a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 4856 bytes
font_01_sfnt_off0000760d.bin
30ce825d08b4cd85a356085bc874bde2b6990713de4861986229c20d351d5198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 12364 bytes

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