Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65684968d717ea4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 04:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a851fbd980b3b0d5769672306b236c SHA-1: 9644372014d57dd6cc530eee389f00f63c6aa516 SHA-256: b65684968d717ea4b83cfa0fa577814cbc7401c511f26002bf70f4c6380ceb9e
150 Risk Score

Malware Insights

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

This PDF document contains a high density of embedded links, many of which point to external resources. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=grammar+lessons+for+high+school+students+pdf', which is designed to lead users to malicious infrastructure. The document body, though heavily obfuscated, contains this same URL, suggesting an attempt to disguise malicious activity as legitimate content. The ML classifier also 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=grammar+lessons+for+high+school+students+pdf
    • http://files.kristinfosterphoto.com/uploads/1/3/1/1/131163601/1f575751c082.pdf
    • http://files.annikabovender.com/uploads/1/3/1/3/131380600/dc56e12e1cf7454.pdf
    • http://tufojera.rearviewthis.com/uploads/1/3/2/6/132682646/2928708cf3e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/japarotivepowepapefikefux.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/aids_and_hiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/70069941353.pdf
    • https://cdn.shopify.com/s/files/1/0431/9605/5711/files/gossip_girl_cecily_von_ziegesar_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/cfa_level_1_books_free_2016.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/12711677584.pdf
    • https://cdn.shopify.com/s/files/1/0429/0438/7750/files/bodyweight_training_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/all_about_space_issue_77.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_off000069a5.bin
b680fc1a756c71f41a6858b6f60aee5ef546c7c5f9f13de4b1cdf1c0298261ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 5600 bytes
font_01_sfnt_off00007c85.bin
42e29b1fdfc9a3a6ebb930e2e5491e1b9618c387abebb27edaf953cd3cdd3df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C85 9972 bytes

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