Malicious PDF — malware analysis report

Static analysis result for SHA-256 813863abff897b83…

MALICIOUS

PDF

49.3 KB Created: 2020-11-03 02:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a73f639dd7a5c80a6656b684b20103cd SHA-1: 2d764e16df742a1e0bd55e82acb93ec259d15659 SHA-256: 813863abff897b83da8872803d6c6b84341e34b1d2c47ffa3dc6718878bf4bbc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of links to external websites, many of which are hosted on disposable domains or known redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL, 'https://cctraff.ru/aws?keyword=scp+049-2+roblox+id', leads to malicious infrastructure. This suggests the document is designed to redirect users to potentially harmful content or to facilitate further malicious activity.

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=scp+049-2+roblox+id In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f9bd09bdf6bc.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/xifid_dakakezinetuti_fixabunu_tujoramodewusos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f986b4e61aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5f9213c28cc15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fa06631842fd.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_5f985c5541ef0.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/pimut.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/nabiporofenaxi_tetebe_gumetepajonejif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5f95aac95bf56.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/modoxuduro_gubixi.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/bb180.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/a730d55f-5490-4f78-8990-8fbc71a117a2/reverse_fault_boundary.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/fipuxo.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_off00007eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAC 5540 bytes
SHA-256: 4d5fd98b69ed4ea5fd57cd458561addc8deaeea3033438881430af1ac3dc5cb7
font_01_sfnt_off000091a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A4 11404 bytes
SHA-256: 967d995914e8eb380dbad007e4fae6564902f05e037894f14f7b48132a82dfcf

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