Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0a04cada1aea67…

MALICIOUS

PDF

76.2 KB Created: 2020-09-30 23:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 644b20023350e3d4ac1d9febead09487 SHA-1: ddbfdc90ff82383c08124b8206b757882cd93a22 SHA-256: eb0a04cada1aea67413e9973a6e41ebe85cbe76035d49add70ae1c5f8459de69
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with heuristics indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests an intent to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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/strik?keyword=isometric+projection+notes+pdf In PDF document text
    • http://files.georgeellis.co/uploads/1/3/1/1/131164048/lemobigivesopoti.pdfIn PDF document text
    • http://files.atlantamedicalaesthetics.com/uploads/1/3/1/6/131606694/vogowarofo_nepakunopisasib.pdfIn PDF document text
    • http://files.brooksidepineriver.com/uploads/1/3/2/8/132814415/e9eb96e8f70431a.pdfIn PDF document text
    • http://files.meadowsweetgrove.com/uploads/1/3/1/4/131406885/2204483.pdfIn PDF document text
    • http://kozipo.interpera.org/uploads/1/3/0/8/130813715/pinasefeveki.pdfIn PDF document text
    • https://site-1039784.mozfiles.com/files/1039784/67840767428.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/gokosox.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/75922418287.pdfIn PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/79450544950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/69480a74-a2dd-485b-a147-251441a82add/25539741457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aadc2b7-7d23-4338-a649-69dc0985f6c5/koxukelagugigutodaxoludox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05607ce1-b845-468e-9fc6-b281dcba01ce/25492499275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9547ede5-21ae-46a0-a769-47ce2e2e73b6/17034577904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c128562-f0b9-40fb-b3aa-d7b46299ff74/87568473184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4f397d-bebe-4384-8df9-e8bf366235b4/bevogajotufamutotewineb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0492bd2-12df-48c1-9f1a-bc7c8019aaf1/liwibi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCE 4860 bytes
SHA-256: 33c17ec8e9eb315ecf8f961f43e3f73e0a41edb95fd41eeea61be2f9f6e944d4
font_01_sfnt_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 16060 bytes
SHA-256: 9e9e380af658987363e39e78a12fe2868871096608ae2090281c9f0c7b2b43c0
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16152 bytes
SHA-256: af193190ca713d949dff13b0d26e8ca7269b63f57b885db0eb814bda8078f495
font_03_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f