Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d9d75864ab17b0…

MALICIOUS

PDF

37.4 KB Created: 2020-11-08 03:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a3b3fecb0f96d52ac67e881410816923 SHA-1: 31a29cf1acdb75ea2a55f46263c455de6994e39d SHA-256: 79d9d75864ab17b0c43675b31e5377fec0e9676f3cf0846f147cc75efd5570c8
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, designed to redirect users to other sites. One of these links, https://traffking.ru/123?keyword=aldiko+apk+android, is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence, suggesting malicious intent.

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://traffking.ru/123?keyword=aldiko+apk+android In PDF document text
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/ab34c5c5c.pdfIn PDF document text
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/zosujefuwazi.pdfIn PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/nazebitan.pdfIn PDF document text
    • https://roruzutal.weebly.com/uploads/1/3/4/5/134592711/gexedas.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/lagatapodegixu.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/manage.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/vepome-jizuwuzozu-duwomirenu.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/rusaka_gawefimasigal.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/veperinubojami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xojomome.files.wordpress.com/2020/11/lujaduf.pdfIn PDF document text
    • https://tisobex.files.wordpress.com/2020/11/sugunevogafex.pdfIn PDF document text
    • https://firomikodow.files.wordpress.com/2020/11/4323902123.pdfIn PDF document text
    • https://xavufirilig.files.wordpress.com/2020/11/88683270252.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D1 4828 bytes
SHA-256: 5a5f9faa279ccc6cba3ec475435ec97ad882ca3f5fa04a935a64aea1bac4b63d
font_01_sfnt_off0000554b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x554B 8860 bytes
SHA-256: 833e3606d6184d715ce75bb1e138c60638578c43bb95ac14b9a5b29505d40f7d
font_02_sfnt_off00007375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7375 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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