Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b95c1318cb0ada…

MALICIOUS

PDF

59.5 KB Created: 2020-08-04 06:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a740cdbaa30336004ee1cac4e9eba176 SHA-1: 5847644f0962da8f2d5cf10032d329e75da8f50d SHA-256: 85b95c1318cb0adad897d2922c85aa648f076ab99c0022006708afbfed4f9ef7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to host or redirect to further malicious content. The document body, though heavily obfuscated, contains the URL which is also present in the heuristics. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=arbitration+and+conciliation+amendment+act+2020+bare+act+pdf
    • http://files.gregbiggsstudiofx.com/uploads/1/3/0/7/130740141/xoruruxoside-tozenunim-bazavaxabifixu-fibaroxetumu.pdf
    • http://files.mountainedgeresort.com/uploads/1/3/0/7/130775679/zafewidaxujilakur.pdf
    • http://files.eleanormccaughey.net/uploads/1/3/1/4/131452783/7679419.pdf
    • http://files.lakeandhillsgardenclub.com/uploads/1/3/1/4/131406885/8048357.pdf
    • http://files.qeisolutions.com/uploads/1/3/0/7/130738652/kimadive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/jubivute.pdf
    • https://cdn.shopify.com/s/files/1/0433/4813/2008/files/88023838081.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/cissp_cbk_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/zisuwivubewunisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/49407413608.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/62038152055.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/fezataledadapefukerikizow.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8418/files/sweet_dreams_marilyn_manson_tablature.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/xodipi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/rolarutozonupikiwesimete.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/vefet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/13935816222.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa40.bin
4748c16ea610d1e9281b6414ab6ce1be91aae874e27271cec9937399f3852f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA40 5524 bytes
font_01_sfnt_off0000bced.bin
0dcf37396d337115cb8e0230b1182dc9515b7f3371d1de701ca711f2a7140db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 10304 bytes

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