Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0eb60b72042da8…

MALICIOUS

PDF

33.9 KB Created: 2020-07-08 17:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 5518783908f1f6d4c44810a70d1fdad8 SHA-1: 0fe5b6f096fa62821d7e301369705f3e28e69dbd SHA-256: 6a0eb60b72042da88133361f345afdb132efd82a76cf78537d0542d1893d2f2d
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs pointing to external PDF documents, indicative of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or distributing further malicious content through these 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.com/wb?keyword=the%20dates%20in%20english%20exercises%20pdf In PDF document text
    • http://files.jakegrahamphotography.com/uploads/1/3/2/6/132696155/popekuwuk-nanudetirava-zigomevu-morix.pdfIn PDF document text
    • http://files.kengoesclick.com/uploads/1/3/1/4/131437513/4c988cc4.pdfIn PDF document text
    • http://files.skincarebyadrianag.com/uploads/1/3/0/7/130775827/6a94d7.pdfIn PDF document text
    • http://files.ancientpromise.org/uploads/1/3/0/7/130739567/e3245.pdfIn PDF document text
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdfIn PDF document text
    • http://files.mendocinofood.org/uploads/1/3/2/6/132683088/6947927.pdfIn PDF document text
    • http://files.pro-mx.com/uploads/1/3/0/8/130874575/a5a7f4be03008.pdfIn PDF document text
    • http://files.opunakesurflifesaving.com/uploads/1/3/0/8/130814513/gezitowejukejekojuko.pdfIn PDF document text
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdfIn PDF document text
    • http://files.theeclecticcats.com/uploads/1/3/1/6/131637325/fced1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fizodudukuga.files.wordpress.com/2020/06/58961790434.pdfIn PDF document text
    • https://zapafolut.files.wordpress.com/2020/07/41423051700.pdfIn PDF document text
    • https://lujipur.files.wordpress.com/2020/06/bajotigebaf.pdfIn PDF document text
    • https://riduvetixaxu.files.wordpress.com/2020/06/wivomazotap.pdfIn PDF document text
    • https://xipunibeneta.files.wordpress.com/2020/06/muxopesejorizaxupowadanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.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_off000048ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48AB 5112 bytes
SHA-256: 220ebdd0812187195e26c174d970ef55b4252d456069bccd9f7f2cdb5c453c89
font_01_sfnt_off00005a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 9468 bytes
SHA-256: 5af5afb3842ae2501e61545750ff00a984a57df2296d7774a31e2efe512bb9c7

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