Malicious PDF — malware analysis report

Static analysis result for SHA-256 029833aa4c4837f1…

MALICIOUS

PDF

46.6 KB Created: 2020-09-18 02:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3192d994893f33030eafa222ae5ce9a4 SHA-1: ecf9315b98adcdba00c071f6a1bc042a63e76374 SHA-256: 029833aa4c4837f1e1e2168a96dd96d6a431dec3e71b45bde79e5b6fd13977f3
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially obfuscated, contains text related to 'mental health counselor interview questions and answers' and also includes the malicious redirector URL. This suggests a phishing or scam attempt to drive traffic to malicious sites.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=mental+health+counselor+interview+questions+and+answers
    • http://ruzadotex.gretcheneveretthardwareandhome.com/uploads/1/3/1/6/131637255/7136936.pdf
    • http://sinaf.ohrmanndesign.com/uploads/1/3/1/8/131871699/7840134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/4107805856.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/43884491000.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/12854454398.pdf
    • https://0066e6dd-2616-430c-b044-e09c5e27f5c7.filesusr.com/ugd/cafc24_3493b9ffa038488a99a3f610bd1500ce.pdf?index=true
    • https://af2bc9a1-3634-42d1-a6da-eac6020fe180.filesusr.com/ugd/4ae4db_9a2e289239de4556b97e7442fc677458.pdf?index=true
    • https://c926900c-7adf-49b8-b6e8-fe55315d4c7d.filesusr.com/ugd/668a47_57c852b407274f7d8cd37c6952afe2f6.pdf?index=true
    • https://106d12ad-a1a4-4b4e-9f83-fe90ec84260a.filesusr.com/ugd/e32576_fff0460d51864964a49a25cbf34e89d8.pdf?index=true
    • https://5e9f5bd3-8083-4d8e-8f69-936f3f7edbf0.filesusr.com/ugd/c83fdb_229359b12fd8449ba57cf64f6675c0ab.pdf?index=true
    • https://afb917e0-43d7-42a3-85e4-649109aa3cc8.filesusr.com/ugd/18ee90_aa0f00ccc5ca40a3a32ed75b7b5916e7.pdf?index=true
    • https://dbdcb07e-3c23-464a-999a-29b187e9f9ae.filesusr.com/ugd/5ad03d_16a4e309223447e89bfac8b5cb6653ae.pdf?index=true
    • https://449034eb-d072-4ff1-9a79-e827780358ca.filesusr.com/ugd/1b0481_79d8dce8ba484dd28a3b613a9751b98d.pdf?index=true
    • https://aba87f22-b7ea-4353-9935-ea71de57240e.filesusr.com/ugd/ee4a13_06f60f625108492d838392735acb6c65.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b2b.bin
947c1876a225fbb67c28d45c377398996bfd43865955bd9f7719d64ccb8f2625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2B 5192 bytes
font_01_sfnt_off00007cd3.bin
8ed0498954797ff2e9357cca76989a2221a221c0dbf5d61b2f37b163d803017f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD3 9972 bytes
font_02_sfnt_off00009efd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFD 4324 bytes

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