Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7de8582bdedf30d…

MALICIOUS

PDF

42.2 KB Created: 2020-10-11 10:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 844949e15ec5eba102fbcb3561a56677 SHA-1: 980232f014d7b7027435e13770c6ee5d28f9e534 SHA-256: d7de8582bdedf30d3a1c914e4aa293d1b42dddb43daeddc88461641ef06441cc
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The heuristic firings indicate a PDF link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution campaign.

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/pify?keyword=isosensuals+curve+review In PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/lefasamonisun.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/62460870472.pdfIn PDF document text
    • https://site-1043941.mozfiles.com/files/1043941/3965885687.pdfIn PDF document text
    • https://site-1042867.mozfiles.com/files/1042867/85915651746.pdfIn PDF document text
    • http://files.woldstrawberries.com/uploads/1/3/0/7/130776063/rofupasopu-kukemuxa-bumalunip-jetaxafam.pdfIn PDF document text
    • http://files.elkhornvalleyhrc.com/uploads/1/3/1/3/131383791/054e1017d64f3d.pdfIn PDF document text
    • http://files.capspa.org/uploads/1/3/1/4/131405927/7843145.pdfIn PDF document text
    • http://files.heimebakst.com/uploads/1/3/0/9/130969562/vikiboxirix.pdfIn PDF document text
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/76517270591.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/jolukezegigutum.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/62670385818.pdfIn PDF document text
    • https://site-1042287.mozfiles.com/files/1042287/muzazufukupediveritivisip.pdfIn PDF document text
    • http://gipagetas.nikiwinston.org/uploads/1/3/0/8/130814591/5404589.pdfIn PDF document text
    • http://zobam.designebb.com/uploads/1/3/0/7/130738526/3336354.pdfIn PDF document text
    • http://files.thyperfectpomsky.com/uploads/1/3/1/4/131453384/pidezesojukux.pdfIn PDF document text
    • http://files.pipelinetheatre.com/uploads/1/3/1/6/131606494/rotakitopedileletef.pdfIn PDF document text
    • http://files.lewiscainphotography.co.uk/uploads/1/3/0/7/130738759/7404018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000066d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D7 4880 bytes
SHA-256: cb3d5a9e5f2ef4945d80a5d3d384a09a977cd9734623220fbfde6bcd5e710a7b
font_01_sfnt_off0000778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 10648 bytes
SHA-256: b477647e1433fc4db144cbdf708f75043b1232d4bcb343a5339c9ef40dc6ebc2

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