Malicious PDF — malware analysis report

Static analysis result for SHA-256 980843eee69a305c…

MALICIOUS

PDF

36.6 KB Created: 2020-07-08 11:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: cee5cd62b9c9fc836dfa20a377981907 SHA-1: 2d1cbe971c6b12187ba35384c244b15d0a180a57 SHA-256: 980843eee69a305c52bb85094bc7f62989d2e1a8be534ac7e72f6baa8939c767
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier strongly indicated maliciousness, and the document body itself contains URLs that are likely part of a link farm designed to deceive users into clicking through to potentially harmful sites. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

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.ru/wb?keyword=dutta%20obstetrics%20textbook%20pdf In PDF document text
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdfIn PDF document text
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdfIn PDF document text
    • http://files.geomaticsworkshops.com/uploads/1/3/0/7/130775053/xiluzakewunuxat.pdfIn PDF document text
    • http://files.kitalerafiki.com/uploads/1/3/0/8/130873830/kovov_tefusegojiwenav.pdfIn PDF document text
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdfIn PDF document text
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdfIn PDF document text
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bikerikotad.files.wordpress.com/2020/07/79888114053.pdfIn PDF document text
    • https://tilakomo.files.wordpress.com/2020/06/xinitigisel.pdfIn PDF document text
    • https://gilolarezuj.files.wordpress.com/2020/07/73385392092.pdfIn PDF document text
    • https://rokonofivadi.files.wordpress.com/2020/06/sowagurovuzewopixivi.pdfIn PDF document text
    • https://buluzoti.files.wordpress.com/2020/06/gopiliba.pdfIn PDF document text
    • https://nopozofura.files.wordpress.com/2020/06/37339170019.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

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_off0000535c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535C 5164 bytes
SHA-256: 40cb6fd234efcd5d84797cd4f150644a843c4036f842d02e9edeb3e4115cc6a9
font_01_sfnt_off00006506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 9764 bytes
SHA-256: 04345921a08ed2ad96ccaf8a1990697aa0366479e27d4f4e2d07548902b55945

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