Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77bf515037640b4…

MALICIOUS

PDF

41.4 KB Created: 2020-10-09 04:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b61198ca3cc721d64744ea461b1fda7 SHA-1: ec54c7fc236457f67f9c5e8697b62efa8da3accf SHA-256: c77bf515037640b4a665855e5350c09ad2ea5ebb91a87eb551e72f05964ce179
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links to external PDFs hosted on various domains, many of which appear to be disposable or part of a link farm. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or distributing further malicious content through the linked PDFs.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=forensics+logic+puzzle+answers In PDF document text
    • https://site-1044113.mozfiles.com/files/1044113/58869506786.pdfIn PDF document text
    • https://site-1038343.mozfiles.com/files/1038343/powozizovizibot.pdfIn PDF document text
    • https://site-1036692.mozfiles.com/files/1036692/87931635342.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/12780914152.pdfIn PDF document text
    • http://vuziviw.penneconomics.com/uploads/1/3/1/3/131381088/fubiva.pdfIn PDF document text
    • http://bopifowo.kansaswoundedvetrun.com/uploads/1/3/1/3/131379205/5586500.pdfIn PDF document text
    • http://files.snugpubcocoavillage.com/uploads/1/3/1/4/131482823/3721711.pdfIn PDF document text
    • http://vabanikaf.huntlyhighlandbeef.com/uploads/1/3/0/8/130874359/biseso.pdfIn PDF document text
    • http://files.7tucker.com/uploads/1/3/1/3/131381540/moderisonobu.pdfIn PDF document text
    • http://files.guillome.nl/uploads/1/3/1/4/131453432/memedimaka.pdfIn PDF document text
    • http://files.essentiallygardening.com/uploads/1/3/0/7/130739826/2ff96017a783c.pdfIn PDF document text
    • http://vobanofa.howellinsagency.com/uploads/1/3/0/9/130969707/9862105.pdfIn PDF document text
    • http://files.sueanderson.org/uploads/1/3/2/8/132814958/rugoxebazamarufizer.pdfIn PDF document text
    • http://niwunu.bankscannell.co.uk/uploads/1/3/0/7/130776074/juxejuwizuxaso.pdfIn PDF document text
    • http://mazumojaj.ms-j.org/uploads/1/3/0/8/130874175/2620363.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000649f.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000649f.bin)
    • 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 extracted file (font_00_sfnt_off0000649f.bin)
🗂 Part of campaign: 7tucker.com 4 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000649f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 5196 bytes
SHA-256: e43db0e9cbd929961fd3bb58181e23dbda365bb9bad8640685b10cfcbecc2c7d
font_01_sfnt_off0000767a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767A 9916 bytes
SHA-256: 4bc161c3f9feea32108881df9f47971e30563f6e33ed1d820010ecaf168fbca1

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