Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad89f48079c7281…

MALICIOUS

PDF

46.7 KB Created: 2020-08-17 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3684ca4fcd9030784342dfaba84cf14 SHA-1: b3ccceec5fea6a71f41e304a100cf4c57be23f8c SHA-256: 7ad89f48079c728143b037fc4244fbac3c9dd8686b7e74c8ea336382b4710d5b
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, masquerading as a study guide, which are designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=best+cisa+study+guide+2019, which is flagged as a known malicious redirector. The document's structure and the ML classifier output strongly indicate malicious intent, likely to lead users to further malicious content or phishing sites.

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=best+cisa+study+guide+2019
    • http://files.adeptwindowsolutions.com/uploads/1/3/1/8/131872199/magomum-volawedipin-nodipojal-siremilawamef.pdf
    • http://vewesi.catranchrescue.org/uploads/1/3/1/4/131438641/3dfbe74edb25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/18606231183.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/xovusapazuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/probability_pitman.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7466/files/71156995335.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/wuvujarov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92835403356.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/gawis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/39352460896.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/algebra_aptitude_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/59124471845.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/davatalimivevusuvijek.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ca.bin
9eaef75901930080e0579e5bdc7495368c043a5b774ce23866184a37e600bae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 5612 bytes
font_01_sfnt_off000073fc.bin
dc679f17538d2334c056ef2c62469387ed99e575bef6b1f58a620aabebe8aff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 11304 bytes
font_02_sfnt_off00009915.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9915 16092 bytes

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