Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdc8680db4b52b6…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 14:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4497b4584f1acac87500d83e3c69b7c2 SHA-1: bc6d47a8cd1b0abd08ef58a9a888edbc9ea91ace SHA-256: 5fdc8680db4b52b67f31bcdb29ddce9ecab02ffa2957d6796e09645f62f8d927
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. The primary malicious URL, https://ttraff.ru/wix?keyword=apostila+de+matematica+para+vestibular+pdf, is identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains this URL and references to study materials, indicating a lure to disguise the malicious intent.

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=apostila+de+matematica+para+vestibular+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b49c6_3c19f6fdc5ce429d9451c91ec2586993.pdf
    • https://static.usrfiles.com/ugd/40b9e6_3f1f47c70320488da618f6e460254721.pdf
    • https://static.usrfiles.com/ugd/3aee12_ce3a815cb29d436f965f20ba925f5338.pdf
    • https://static.usrfiles.com/ugd/b8c837_6102768d76804396873798d0d77a7a9f.pdf
    • https://static.usrfiles.com/ugd/0bcf16_c4ea69fa61614afe84164ae1223ea903.pdf
    • https://static.usrfiles.com/ugd/f1780b_0058db07cf25414589ad25445509deda.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ac01d42b1456f88727182eb37006b.pdf
    • https://static.usrfiles.com/ugd/defdb4_62706ccf73004b44aa6e58111a83f2a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7daad746264437b8104b43f5a50dc1f.pdf
    • https://static.usrfiles.com/ugd/2f07a1_19fc0dfcd4164eb4ad7aa1b2e03bac20.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/91836106769.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/nezivopisoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/bazipodatu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/tenergy_lipo_balance_charger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/rujakufuzoliluwawetedeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/82661882317.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/importance_of_census_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/zitutemevasagaliza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/complications_of_acute_myocardial_infarction.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_off00006597.bin
c7c7f17dc3ebf16f72ee38a2baa4346b1866d8c089efc7faa961a951b18e9ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6597 5488 bytes
font_01_sfnt_off00007824.bin
7104bcf18d7ad1652c548695254a751559612fb70b88c8f455d390d0d3068b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7824 11440 bytes

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