Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91a7df524f08aa…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 12:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59b89ec774d584e484e817ed5f9c9904 SHA-1: 0338a979205f6b730df738c84014313ab960d91b SHA-256: 5e91a7df524f08aa11fa956d81c426c2a240fa13b6265b75b347fb5d02c76a87
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, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely for further exploitation or phishing.

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/wix?keyword=%25D7%259E%25D7%259C%25D7%259B%25D7%2595%25D7%25AA+%25D7%25A4%25D7%25A8%25D7%25A7+4+%25D7%259C%25D7%25A6%25D7%25A4%25D7%2599%25D7%2599%25D7%2594+%25D7%2599%25D7%25A9%25D7%2599%25D7%25A8%25D7%2594
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/200_pound_beauty.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/favosemamosowurazunoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/joxefatudubaxikerel.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/85459125618.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/raw_diaspore_ffxiv_clock.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb62867b2c3b4fd69ff85a94f7b6cad0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3593d4881cd4e9a820d1347b16892ce.pdf
    • https://static.usrfiles.com/ugd/822ecd_5a86d5b651bf4f8eb5a823f917fb63b2.pdf
    • https://static.usrfiles.com/ugd/1f2646_e439b250c5f64ce28500bf68826e9ada.pdf
    • https://static.usrfiles.com/ugd/865d50_3cd6aa9e78624716a706b771a8671827.pdf
    • https://static.usrfiles.com/ugd/b8c837_052d99a1c8654a9eaa0a961d2708cee3.pdf
    • https://static.usrfiles.com/ugd/dc98cc_eaad51fa13a04e06a7b6fc59f44a90dd.pdf
    • https://static.usrfiles.com/ugd/764aaa_9218dcb20e9a4a48872f853d2d87ff17.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3cca861d73d4e9bb6428ff1c4cdf28d.pdf
    • https://static.usrfiles.com/ugd/5899d5_aaf37463ffd349b5bd5889eb21b025c4.pdf
    • https://static.usrfiles.com/ugd/d5415a_7b986b21f1c94750aba7f172438ddad8.pdf
    • https://static.usrfiles.com/ugd/3826db_c83bbb48ef504dc4a4255f935a375e9c.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_off0000697b.bin
ba9c7edbbbd4f565a8322922cf9314af00ffa61e04c6cc57bf466478f8f685c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 5164 bytes
font_01_sfnt_off00007b61.bin
9598c1b8ea95a76393b7dd04c1a64c3dde68e584e62f76c4295ea8de2f94e117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 10788 bytes

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