Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d7ddab0f9546b…

MALICIOUS

PDF

48.4 KB Created: 2020-07-29 17:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53b8dc614c522fc629ebe93761cf9c5 SHA-1: 771c7bf246a1b4d260d662d9e6a3b0a71ac0c5fe SHA-256: 4a9d7ddab0f9546b290ef6e618718df3f50a16dbf2557c614d81847d55c3467b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=tardiness+action+research+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'Tardiness action research pdf'. The ML classifier strongly flagged this PDF as malicious.

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=tardiness+action+research+pdf
    • http://files.angelahokeauthor.com/uploads/1/3/0/8/130874101/ef8701aff33d3d.pdf
    • http://files.hooahhillfarm.com/uploads/1/3/1/4/131453615/78347cad6.pdf
    • http://files.keystodreamtravel.com/uploads/1/3/1/1/131164079/0269727bdec17.pdf
    • http://files.gbartistsassociation.com/uploads/1/3/0/7/130776728/zipelurusativuki.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/wafolutasuves.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/50001962826.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/94652463019.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/50070374890.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/fumexafegixijilal.pdf
    • https://cdn.shopify.com/s/files/1/0438/5393/8853/files/kevezimovoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/fiwabafowovarofiforosotag.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/gunuxerutog.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/vopafigov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/fopubizuvixezuwabutusewib.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/xopixijopitujuta.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_off00008125.bin
cb2a879bc9b9da896eebf9c21befa40fbc912e95e8cdb823f7f64a3f49332b7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8125 4948 bytes
font_01_sfnt_off000091e6.bin
9c8817ea2f2122ce00ee000b4c7cf887a1e5de241af83ac5aad9ef66b4ecd9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E6 10060 bytes

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