Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1d7cd2ab4dcc5e…

MALICIOUS

PDF

37.9 KB Created: 2020-09-17 00:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e37fa90e3c2bbf0373269fed5588f8 SHA-1: fbc6c838a1de5f45e3045eb88653a94570b8d4be SHA-256: 5d1d7cd2ab4dcc5efe7260fed47113d0d3c45afe20389925354605ce5e8bf185
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 redirectors or unknown domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious content, likely for credential harvesting or malware distribution.

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.cc/wix?keyword=bob+marley+afro+dreads
    • http://vegulusix.ameliasherry.com/uploads/1/3/1/3/131379730/kejelebizogela.pdf
    • http://jelixuj.hilarylowbridgeyoga.com/uploads/1/3/2/6/132683169/2409d.pdf
    • http://files.greatnecksouth73.com/uploads/1/3/1/3/131379183/fegafogino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d9c60466-5b49-46ea-a280-bed6b471a69a.filesusr.com/ugd/740d8c_6ca60bf7c9c34234a4d33dec1e672111.pdf?index=true
    • https://fe3724bf-5a07-46ac-b7e9-3c708db54e03.filesusr.com/ugd/cc089a_81a6d7c89c8d499fbd53e82de5b435d1.pdf?index=true
    • https://42e44a5c-54e7-45bc-a7f9-5610469eee50.filesusr.com/ugd/5de1df_c82b8b7ddf1e48199187a7d48f23ab32.pdf?index=true
    • https://1d3742af-7874-477e-85ac-9cf69a4c9358.filesusr.com/ugd/035627_852d601bb5204ba08a8ee3c4da8f6ec7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/naxalesirarofikerobika.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/wutapeluxukusevizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/zezedewapexidejelug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/guleropiporidez.pdf
    • https://d927d002-92a4-4726-9145-2acfa094f702.filesusr.com/ugd/5aec95_ec086f0d37514ef5908a73fc068050e2.pdf?index=true
    • https://69706681-db1b-4d35-b37e-a1e90d20c5f9.filesusr.com/ugd/ea2f88_89530ccf9e864142b545c62b7b4f30fa.pdf?index=true
    • https://06b006ca-3ab9-4eae-bfae-54e72a1a56fb.filesusr.com/ugd/6cf392_92b6a64f9e0949f48863da6630a4fcd8.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_off000056b5.bin
62fd61887a4d5d6bf0f5809f0f056412ad41f369f328976584f13bf7e47df379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56B5 5344 bytes
font_01_sfnt_off000068d1.bin
43a25a984ee421720117cbacbb66aad544f0dd136c58875df893ad9f05682150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 10120 bytes

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