Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bb5be1ae97dfd0…

MALICIOUS

PDF

37.7 KB Created: 2020-11-03 21:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c36067fc45b3fcaf81ac672250aed726 SHA-1: c497ed6b4cb167cbd1637987195db387e3fb5765 SHA-256: f0bb5be1ae97dfd0beb12fccd2427cddc484d6608128bae72b1e8cadb0bece7d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to lead users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://cctraff.ru/aws?keyword=park+ave+school+nj as malicious. While no scripts were extracted, the primary function appears to be directing users to external, potentially harmful 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.
  • 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://cctraff.ru/aws?keyword=park+ave+school+nj In PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/899dfd75b.pdfIn PDF document text
    • https://jokepalebaja.weebly.com/uploads/1/3/4/3/134360350/nufuxupijowuz.pdfIn PDF document text
    • https://surebexu.weebly.com/uploads/1/3/4/4/134458457/likubomet.pdfIn PDF document text
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/1925824.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/01a8a640c6904ab.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/4241834.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/8432330.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/a25dbc83-04ad-4e79-a035-11fae08547a6/wilmington_to_philadelphia.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/17085683659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ced9c5e-24f1-44bf-900a-18220fe74012/cphq_exam_secrets_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8114e42c-7fb9-4129-ad77-092497dfb0fb/rajabujobilefevepusidima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d228cb7-aaac-4015-9453-4e8174c43ed9/vakuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838edb19-a12c-459a-b3f6-52544ea13951/zuxozegixusitibov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbddb74-e82c-4357-91dd-36febbf4ece7/88864873269.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/doc._autotable_in_jspdf.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_off0000558c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x558C 5088 bytes
SHA-256: a3551806a4ca51fc2b8e2121a84c391e1e7df1d0c6f6693110bb892669f8bb69
font_01_sfnt_off000066e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E1 10220 bytes
SHA-256: 81aba01e576dd5af780c91c357cf9e459fea00f338c21c7a207295a9a86434e2

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