Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4b9debb5fdc130…

MALICIOUS

PDF

43.3 KB Created: 2020-09-19 13:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e08db035c56dee8fc2c3b8180baa011 SHA-1: 3d8bbbcb057edfc3abe823f64fcbb9a52e130029 SHA-256: 7d4b9debb5fdc130f60564e9fb5b22680c9f0f39e8216ddeae3a904099baa38a
184 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 disposable hosting and redirect to a malicious URL. The document body, though obfuscated, contains the URL 'https://ttraff.link/wix?keyword=energy+transformation+lesson+plan+middle+school', indicating a lure to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=energy+transformation+lesson+plan+middle+school
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/jafufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/appointment_letter_format_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/283201777.pdf
    • https://cdn.shopify.com/s/files/1/0433/4983/5930/files/platform_bed_full_size_with_storage.pdf
    • https://b8c80305-e0fc-4ae8-ab04-9662fcf4f945.filesusr.com/ugd/ce77c6_69b1e14bba6f4e868ec287bd0496da60.pdf?index=true
    • https://962d7fa7-1653-48f9-b644-cbc2735c5af3.filesusr.com/ugd/510a18_48e19a571a2e4b33af87a84fb8f9fee7.pdf?index=true
    • https://8cff560a-8894-4161-bce6-e1f06dc1252f.filesusr.com/ugd/a91264_c27054cb03974c46883ba1a0633f9743.pdf?index=true
    • https://ff8dec17-bec4-4c32-be4d-0153dea53b22.filesusr.com/ugd/d6af85_a66992567bfe4ae3b94664c42b499ccf.pdf?index=true
    • https://4e7a8afd-4049-4f78-9664-eecfb6d9eccf.filesusr.com/ugd/fe83c3_5cd7e12d74ce441e97f7211e5456ae96.pdf?index=true
    • https://cc588285-537c-48b7-8e1b-81d3194bc24a.filesusr.com/ugd/e00bd3_504fdc283fe1477f9347ba95476eb956.pdf?index=true
    • https://974040bc-7765-4dcc-98ae-6e017be0c786.filesusr.com/ugd/ae059d_f27522b8e8254d3c985ca7f8827dd97d.pdf?index=true
    • https://d6fb9d7d-cabf-4820-8d01-427f88e89bb7.filesusr.com/ugd/29c71c_867af14850534b709d591313e31f5ab6.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_off00006aaf.bin
48e876163ec65bd72e6dba69a087887f6dbf6fe95f6b36b0df3316e93aea28a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 5628 bytes
font_01_sfnt_off00007db4.bin
d3785ab7d53e6888f4d5d676cdb8ba4fd4f6cc8d9fd539fac280695379faf6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB4 10140 bytes

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