Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7ba490d461ac18…

MALICIOUS

PDF

35.2 KB Created: 2020-11-03 16:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba4e2dc37ef870a2f51c65706f104102 SHA-1: dea7bf7e69927173e7dca709a3ea3b0837a6e672 SHA-256: 7d7ba490d461ac181b38fdd726d34341824576dfdbeac973fc65d4328a781d27
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though obfuscated, contains a URL that is also present in the heuristics, indicating a likely phishing or scam attempt to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=ashtabula+county+ohio+auditor+website In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f881b08936cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f9bf02332ef1.pdfIn PDF document text
    • https://lemefinafotujux.weebly.com/uploads/1/3/4/6/134606632/1226074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5f9d01bb17cf2.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/4326411.pdfIn PDF document text
    • https://segawerod.weebly.com/uploads/1/3/4/3/134313685/7933638.pdfIn PDF document text
    • https://zinivopupo.weebly.com/uploads/1/3/4/3/134386920/b6df19e11.pdfIn PDF document text
    • https://lamuvoraraxuz.weebly.com/uploads/1/3/4/4/134486612/pojufu-ganiwewa-nuwam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f8958ff113c5.pdfIn PDF document text
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/7c3cd4fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88637336-40e1-4b46-bd48-73a92160f4a5/wobex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec77154-8a0b-4b16-8f88-36bc522da88a/pafibatosowofexuvukutuba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0A 5352 bytes
SHA-256: d2c76df20c58c7d69c1031cea016c8c6778484d7538b4aef63e752e8de095abe
font_01_sfnt_off00005c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C47 10592 bytes
SHA-256: 2f3bb1e087504e8894fc0203c37187d3c3b38724a3b378baf7a365c6d15f6e8e

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