Malicious PDF — malware analysis report

Static analysis result for SHA-256 31511a81ad448f0d…

MALICIOUS

PDF

47.6 KB Created: 2020-10-28 20:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4e452265b7f7764bec1391cf308961d1 SHA-1: 15f1a45e03f0874ee0bf53253ad3e279c360d546 SHA-256: 31511a81ad448f0d8a85aa942d616227186cfaa35e8f2e2b1d42a7b3b5356b8f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies one such URL, and the PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=york+river+state+park+fishing In PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/guzuxodowibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f8e41abd2413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f94f7b7571c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f8c8e78d3e2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5f8b596530cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f90b12de5465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f8ebb1c1c9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f91f00f0128c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5f8a03b3647de.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/54c9162ea12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f90a23bbcac0.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/d83aaa79-dde3-4a5b-badd-3f9137283bec/what_happens_when_you_press_alt_f4.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/80588444505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b831876f-b895-42ce-8324-971b35b6fb2a/62833584520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7482f89-dd5c-4997-84c9-16b6dcb08998/39053358600.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/zefil.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/mirodimuraleberunisuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c80fab-d966-4362-ba74-fe62df08facc/jazapu.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_off00007cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 5216 bytes
SHA-256: 8d373faed1e4b793739ec321f5d9cd882ab1af26f4b8c53e0299badcf70d50ce
font_01_sfnt_off00008ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBE 10264 bytes
SHA-256: 150af759294ea788385acd430258d618974396293c8ad37037f8cf1c49740273

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