Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ebc824a05ce52f…

MALICIOUS

PDF

34.5 KB Created: 2020-08-30 09:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddaa0e2dfc81a5bc0a3fe59277b2e583 SHA-1: 8bb92e00ec08b840e5686bf9a40c5cb4ad56a67d SHA-256: 02ebc824a05ce52f3fc49395b167effda0170084b867607ba82d57cfb532ff77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and references educational material, suggesting a lure. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to distribute malicious content.

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.cc/wix?keyword=us+history+book+8th+grade+holt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b0b521_54dec289d9dd417fa0d84e8be006f0ec.pdf
    • https://static.usrfiles.com/ugd/429b25_676b6c6f42294d88b255c69cd7c4b059.pdf
    • https://static.usrfiles.com/ugd/2f8cea_305f4d2b70654677aedc5e11c9aa4cd9.pdf
    • https://static.usrfiles.com/ugd/63022f_6be4cc3e81c74f919df7e70a54f883ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_6263b47bbb844538963b7dc5bdffd8f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb6f6618fa6248839213a2e12fc1b0cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a37ec38b1a34ec982127b418537f6c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_11f7ecd756004282906389a3974d8e0e.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3582/files/nubusovurusiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0382/9657/files/nice_guidelines_infective_endocarditis_quick_reference.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/maintenance_report_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/66665631611.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/jijafilowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/book_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/what_caused_the_abolition_of_slave_t.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/78245744252.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_off00004afe.bin
41480aa71839093e19c2bf4e3acd6fbe54c5f4646f600853740f83a273da9d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFE 5576 bytes
font_01_sfnt_off00005dec.bin
a580c63811dbd309f105aac7d3700c9018c1454bc42cff8dfe10ba71132c64fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 9280 bytes

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