Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb70b534746852f…

MALICIOUS

PDF

144.6 KB Created: 2020-09-08 12:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4f8dfbeece44c16f8cb84e23b7bea59 SHA-1: 08632955075caba66fdbaaf992c01a8d2909ff39 SHA-256: 0bb70b534746852fa308a574c49381aa08d83eaf05687d389ad14ba2de111ab5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting an SEO link farm. One prominent link, 'https://ttraff.cc/wix?keyword=endocrine+society+male+hypogonadism+guidelines', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating a likely attempt to drive traffic to malicious infrastructure under the guise of providing guidelines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=endocrine+society+male+hypogonadism+guidelines In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/architecture_portfolio_examples_for_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/the_karate_kid_title_song_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/pufevufogafotaxor.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fef373_567a038f0c894b33a2f4d5890eeff21f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f6317ec8283a41588bc32b9bc0445cd1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d01287_997febb2aa4049f3bb627bebc4236efc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b0c717_3ffdf4adbb3b476095c21ea360d76982.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8dde66_f9a02af0b02e42a6902f69e3fe8d16fa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/784815_a580c3b360584a858b5c76e23f105dcc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6fab0fb2f8284ee8a177317f2dddbf43.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f5a024_c876ff919679468b9a60db56e91f40c1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/28b3f7_d7b9ae0cb91846f1a3bb2580a1515b3e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/81ef4b_1871e0b935af4c0b865d1c962369b397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/ehlers_danlos_syndrome_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/b_o_t_a_lessons.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D952 5544 bytes
SHA-256: 6ffeb841ce2438d1232fa490876a5bd626dbd9a746c00066188ee12e9c5696c4
font_01_sfnt_off0001ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC0B 15932 bytes
SHA-256: 97a028b97aa89c842ca0a3ccf035af3f807f048a2003e360da79bd1541ed73cd
font_02_sfnt_off00021dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DEA 16420 bytes
SHA-256: aa6f67723388710c2271b348baa7198f23e784cc42925c4b34c1e3643d970aef

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