Malicious PDF — malware analysis report

Static analysis result for SHA-256 81063566532c2bd7…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 21:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7c90b6ea3b39ab9d5bb9c9614227576 SHA-1: 1e28c28cef36fbeb50a55edc7a0b967c93a31e7e SHA-256: 81063566532c2bd7b6d27e6bd110e15186c480821bd9b7ffc7aac71fbf766279
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ttraff.ru/wix?keyword=pushing+the+limits+epub. This behavior is indicative of a phishing or malicious redirection scheme, likely intended to lead users to further malicious content or exploits.

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/wix?keyword=pushing+the+limits+epub
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_377e04835461445e8a40b43b3bc5259b.pdf
    • https://static.usrfiles.com/ugd/5be868_9ec1c1082a1b43e4af21d3c9275706c7.pdf
    • https://static.usrfiles.com/ugd/eda9ba_c5f215a6773e442eb52eaf5e0ea58646.pdf
    • https://static.usrfiles.com/ugd/b8c837_47bf84b640f6426cb4871c64fbd75f2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e362e22f6a045fbb111428791bbeb6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cff675cc254f44c1bde6a67e3e295c02.pdf
    • https://static.usrfiles.com/ugd/b8c837_65ba4661c4114ae5b19122fcf15efaec.pdf
    • https://static.usrfiles.com/ugd/353d00_6003a5dcbf7e46c8a6f109f138cd03ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_46ffed815959402a96d0ae1f5e3eee2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e334b50ff0814d4296a42551ef71dad4.pdf
    • https://static.usrfiles.com/ugd/7f46b5_6d9cde98802942fd918c8f911c388bf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b791972170c8475b940e8e287c149e54.pdf
    • https://static.usrfiles.com/ugd/c8a981_e11c1afc9a0e41d5afc6351758bc7d12.pdf
    • https://static.usrfiles.com/ugd/b8c837_5efa5754b4034f06a5226a533c3911f5.pdf
    • https://static.usrfiles.com/ugd/fb83f1_ee021f4e82564a4c8b48495ed458ebc7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006728.bin
097878398dbce0590ccb9a7935cae439e5b0b44aeae3f3b3108658c0a5e0c201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 4840 bytes
font_01_sfnt_off00007764.bin
a438c6d855cbc8f45aa443e220c312d098075d9db3e45f40127b2df94920fec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7764 11448 bytes
font_02_sfnt_off00009c91.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C91 4324 bytes

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