Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b56fa6b49efb7…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 21:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0bd4007fa69d6d855a5f2bcc8f38541 SHA-1: 4185f625f8fe77280209407c0c211f3a7249005b SHA-256: 5f6b56fa6b49efb7b8bebab5c12e3b88eb74d6e077f1e14263419651e8e2ca1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text suggesting a lure related to 'Isis template joomla' and includes the primary malicious URL. The ML classifier also strongly indicated maliciousness.

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=isis+template+joomla
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_adbeaf83cda6478c97d63ead09e9c5b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.pdf
    • https://static.usrfiles.com/ugd/eed56f_1773068af5384dbb8182245bf4ecd9b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e7c9c0c6b8a4e9dac1d6d36128f7545.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c60dc9215f24256a5f9b967047a8e19.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/what_is_nfo_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/webojitomuxeboxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/7204687606.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab918a06946b4d48873b31213d183f3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_54acd1b4359e40bab030e4b644c34145.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_off0000501b.bin
19dc95a6e547f1c04dc7c9c6f62d3bd5b8da63c9e33efd7202c15e8b617ed38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x501B 4884 bytes
font_01_sfnt_off000060a0.bin
e49610485fe3d577e06a33be60c2414bab09f33d4f175a4511dd7b51cd251ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A0 12636 bytes

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