Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c786654351ac67c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 02:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2e61dddd9bf070acd7e5bc8e2e1067a SHA-1: 56004b1e48a762a1b89f804a33475d59893955ba SHA-256: 5c786654351ac67c2f72426ced1ad39689986e1a048358f2e17add01b0787e5b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on Shopify, and one critical URL that redirects to a known malicious domain. This suggests an attempt to use the document as a lure to drive traffic to malicious infrastructure. The ML classifier also strongly indicated 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.ru/pify?keyword=kartoos+anthem+new+song
    • http://files.biglakeelementary.com/uploads/1/3/1/8/131856632/bopexuselo.pdf
    • http://files.diccklann.com/uploads/1/3/1/4/131407042/1407674.pdf
    • http://files.dustyroadhorses.com/uploads/1/3/1/4/131453725/kafovovolapufusix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/adaptis_gel.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/58397011769.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/eu4_world_conquest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/kilozavidovisudadimeba.pdf
    • https://cdn.shopify.com/s/files/1/0448/7554/6791/files/bteb_result_2020_6th_semester_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/autophagy_fasting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/17243019772.pdf
    • https://cdn.shopify.com/s/files/1/0433/8820/7254/files/nababe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/dofiler.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/93449548861.pdf
    • https://cdn.shopify.com/s/files/1/0439/2920/6939/files/rujadipada.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/tologaremitenopugutar.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/lubavopepetulafujisijana.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/fawexipab.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_off00006937.bin
bf2bfc7a30ac1d2439f06ab6341499bb329a507ebf98151a67a74e3aecffd65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6937 5128 bytes
font_01_sfnt_off00007a96.bin
fe5aaa36736b866fa1b2c7ce7ca6f1e3265ae275a8e158f404b4222a78ab576e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A96 10592 bytes

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