Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bce18d3c9fafbf…

MALICIOUS

PDF

44.1 KB Created: 2020-09-18 07:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bbb58875226c94aa8bd0d0c23cf2fe4 SHA-1: 8d2fd464d885f3dbebd2fbfc3998da55d6549dc5 SHA-256: 65bce18d3c9fafbf1238d4ade597dab8def209263fbc6468edbd40902273a5fe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to various external PDF files. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic.

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.club/wix?keyword=tomtom+spark+gps+watch+manual
    • http://files.gypsygeorge.com/uploads/1/3/0/8/130874162/nogabowepar-zanun-situxidokatapa-rixalodevom.pdf
    • http://files.waitlessplay.com/uploads/1/3/1/0/131070713/pedegixipapenenom.pdf
    • http://files.ranchnomade.com/uploads/1/3/1/4/131483249/2685671.pdf
    • http://files.limitedrangearrangements.com/uploads/1/3/0/8/130874566/1402744.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://40e67a42-b51e-4e4b-baa9-6d21644e8532.filesusr.com/ugd/6260fe_a3da30c2c5444f5f89d8ae1da6b84242.pdf?index=true
    • https://cf6beae2-13cc-466a-b700-0a27a642779a.filesusr.com/ugd/4bb894_3982d1bb76954bdf9a4e01de8ad1935b.pdf?index=true
    • https://7f77d6ca-70ae-4cd1-b1bd-51636b0a94a3.filesusr.com/ugd/bc0b97_f7ec8d72bf394ccf8c2ee115e1290fb4.pdf?index=true
    • https://9f7b6a81-ac77-4f22-b935-2169807c1509.filesusr.com/ugd/238140_e0b371e6b59d4cef8bd904876e8fb2b9.pdf?index=true
    • https://027ed44f-0e84-44f2-937f-320f0a69dd06.filesusr.com/ugd/e7e4a0_8cbfef1243e340d7b7b4247ac3df160c.pdf?index=true
    • https://cfea8c4f-2ee4-4bb3-8b26-f564a6249ebf.filesusr.com/ugd/08e331_3a99ecd23ed8472da3896eca500c1118.pdf?index=true
    • https://59d47838-cb3b-45ff-b83e-b40435f89ede.filesusr.com/ugd/a4ea6c_15393a8162084e33864c7ee74c62e47d.pdf?index=true
    • https://a8f3bd7e-3036-4c8f-94f0-e3c172807512.filesusr.com/ugd/811c4f_25a748ab1167448b99bcf52f01552fa9.pdf?index=true
    • https://136ce65a-cc56-4a9c-98d9-d08670d8b998.filesusr.com/ugd/accd1f_8e22da55a7ef46aaba5318ea8d19b252.pdf?index=true
    • https://8b0477b0-2fdd-48cb-bab1-afda3e72c5e2.filesusr.com/ugd/10e3af_b85f220c23c34381b7089f070e95c718.pdf?index=true
    • https://9c05afd2-1a8b-43f5-adf8-0587100365ff.filesusr.com/ugd/b463f2_8bf53c5d9c8b4613a31019dbfdb534de.pdf?index=true
    • 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_off00006e2c.bin
f5205b51751b4c63811b679db78062cb0d803b28a68589f8eae092015dc4cf18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 5452 bytes
font_01_sfnt_off000080a3.bin
1684ab19c28bfdc3d93da0bb496cbfa59eb7e08538059c98b70b1cb70f56ac1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A3 10112 bytes

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