Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4ff7c889439139…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 23:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba653dd8301ba56cf0872334ee0e97f0 SHA-1: c643cb2fe09e752172f420846af38de284d57ffc SHA-256: 4c4ff7c889439139f80e9d500eede9ae10686034a85e6b61c6ba1ffb52c76ecf
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to the linked URL, suggesting a lure. The presence of a PDF link farm heuristic further indicates malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=gluconato+de+clorhexidina+al+0.+12+pdf
    • http://sapijope.1860sciviliancelebration.com/uploads/1/3/1/4/131453645/padigodetiloji.pdf
    • http://files.vincetaylorslawoffice.com/uploads/1/3/2/7/132712003/df12b7ddc6f89.pdf
    • http://files.phoenixtherise.com/uploads/1/3/2/6/132695493/0645c2.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/kukifiwotituzitisotigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/17673655417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/68202570759.pdf
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/curriculum_vitae_formato_para_llenar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/leluzukaduwen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/wibenugaragewop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/gosoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/dabubew.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/80788338834.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/29471362959.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/metabolismo_aerbico_y_anaerbico.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/5988187875.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f9.bin
568069d233c6166db68511a6291661bfc5f72fc205d6c4a7934b575129671b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 5520 bytes
font_01_sfnt_off000075cb.bin
8fab62b86183153f235b5b1b923a76ff61d5d6fec7f8e950b74513344e700459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CB 10376 bytes

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