Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a94de9a474e06d9…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 09:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093cc9f9c0fb003ea25f6d1ac6d7f809 SHA-1: e784b26214e2b887af57078b99e52bc0d7cee56f SHA-256: 4a94de9a474e06d940066e878ea04e30b6511dd0638f80086c24b860a637833c
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to other PDF documents. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages.

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.com/pify?keyword=diocese+of+bridgeport+abuse+report
    • http://files.hubbymoments.com/uploads/1/3/0/7/130775837/womepog.pdf
    • http://files.nekimastrategies.com/uploads/1/3/0/7/130775001/musekogumod-xewuxarejaf-jupeku.pdf
    • http://files.winnipesaukeeplayhouse.org/uploads/1/3/1/8/131856713/c862bda7bde6e.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/free_agnes_monica_teruskanlah.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/digajasewugizegixugare.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/23527854358.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/bescherelle_la_grammaire_pour_tous.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/vagelep.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/zalasogofuxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1567/3752/files/argan_storia_dell_arte_moderna.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/gebefewebozipuwezudupigis.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_off00006e2e.bin
995910c4b9e5f24519dd5a06d2bbd5e1d4a1da556ea38359eee39e8c55507e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2E 5428 bytes
font_01_sfnt_off000080a2.bin
5de00492b993ea47a7667dbb2e57abb14d117ba991cbc3f8e924248a3cde1f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A2 10140 bytes

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