Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e45eebc09dd5ef1…

MALICIOUS

PDF

43.5 KB Created: 2020-10-27 07:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 07f99c08382eb8072a4ac3ae85455a95 SHA-1: 32853ff4e2141e812940c324062b05ca4e79ee99 SHA-256: 6e45eebc09dd5ef13eb8963c67f4f6c52c47410bef7e175f01dc51a94ed3a3a6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another noted a mass of external PDF links, suggesting a SEO manipulation or content distribution scheme. While no scripts were directly extracted, the nature of the embedded links and the ML classifier's high confidence point towards a malicious intent to redirect users to 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://ggtraff.ru/strik?keyword=serrapeptase+scar+tissue+surgery In PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/norulikinivin.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/3895455.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5471a811b.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/pinozepajab.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/wafimemidilenuboxawi.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/32c160ed5a15f.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/warariv-jonor.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/luranabimujexev_lubudarepana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/mifudusofid.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/28535715093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c0e04a-b49c-4b68-b7db-4900ff49e2e6/48608896262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454aa181-8714-4930-a399-f941ff3bb9d7/46155317054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fc43dd-c142-4200-9795-196037d0e72b/2496306068.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/act_of_contrition_catholic_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/diluril.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7457/7086/files/28726623075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9484/4585/files/indirect_tax_b.com.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_off00006c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8A 5272 bytes
SHA-256: f7231b8c81a7741bee11d4271f0ece5f3ad1ba51f7d97522c8caa026585d5df2
font_01_sfnt_off00007e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E88 9936 bytes
SHA-256: cc020214e52a21174aacb1c5b99f6d9e44b416bdfb9565214e79b65378343bc3

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