Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8e6157901bd834…

MALICIOUS

PDF

39.8 KB Created: 2020-11-01 02:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 949cc8b0686dd67125fc89bd5cc4b39a SHA-1: 2dba83619dc9daf824c21a496d7da94fbd7587f9 SHA-256: af8e6157901bd8343158263e581c844f82369cda5eb2d87d4138b7b672a80011
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the heuristic finding, suggesting a lure to external malicious content. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

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 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://ttraff.com/123?keyword=bearcom+bc130+manual In PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/ragomika-jamuvozidot.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/robumatazudavij.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/9f61c93d.pdfIn PDF document text
    • https://busigejog.weebly.com/uploads/1/3/4/0/134017549/3711642.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/5008433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f933d0792b66.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/be0a67b6-17bb-4d30-b290-d38ec172076d/58606007179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0d1a46-d581-40b2-8c1b-538cb26f9e31/49921703106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3040b5b-4a3d-467c-bf0c-9834df12d73b/referencias_personales_solicitud_de_empleo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54a80e9-a6c5-4e63-803c-80aae1923126/ppt_ferroelectric_ram_seminar_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/46077077532.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_off00005f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5B 5312 bytes
SHA-256: b7e19ade15cf96a3fbda58bcbd2399e88f67e224cfc9f243ad38e7787c985e1c
font_01_sfnt_off00007156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7156 9844 bytes
SHA-256: 3bc26b3142c13bcac93dd60e5942fc77f68488a71d548eae011cf968ebad57ca

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