Malicious PDF — malware analysis report

Static analysis result for SHA-256 16548a3503c577cc…

MALICIOUS

PDF

35.8 KB Created: 2020-08-15 02:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50a9d4d355c610fae76911b424e83069 SHA-1: a9a8e78746d6871b2b093b0a9547c0e35281e556 SHA-256: 16548a3503c577cc1f69ee62bf11ec2e5ea54f5233763943e9b61c7f881e1689
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 a redirector service designed to obscure the final destination. The primary link directs to a URL that appears to be part of a link farm, likely intended for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious infrastructure.

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/pify?keyword=vertical+banner+template+psd+free
    • http://sitona.pattykeller.org/uploads/1/3/1/8/131871390/bekebiro.pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • http://files.desert-green.org/uploads/1/3/1/4/131454850/zabivoburox.pdf
    • http://files.you-net.eu/uploads/1/3/0/9/130969689/bizusutapezu.pdf
    • http://files.onlinemobiletrainer.com/uploads/1/3/0/7/130776266/4990596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/gapirujotenujabonabew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/tafirij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/amisom_mandate.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/xevemixuguxufidebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/78229748602.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/jeguzawudajifulede.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/payroll_management_system_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/27272069167.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/42212347946.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/kannada_english_dictionary_app.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/datufugeger.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_off0000527c.bin
7b4e48092195262daee30c1f82d48943ab342a954d1e8ab2da07b906fe645883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 5408 bytes
font_01_sfnt_off000064bc.bin
a9b3476c6a23e8b57759779b40f8223cd6930c83e9e4e0998be94085e060ded3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 8736 bytes

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