Malicious PDF — malware analysis report

Static analysis result for SHA-256 9970bbfd0946e177…

MALICIOUS

PDF

41.3 KB Created: 2020-11-08 06:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd3e156ed17179b7a79c56aa9d13432d SHA-1: 17131cf599d78e8bc2ac9e6436a609c16ca6944b SHA-256: 9970bbfd0946e177db78e70816052aafba27f780db45f498e2620785f65f0b26
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/123?keyword=download+picasa+3+for+windows+7 In 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/f234cc36-511b-4413-823b-14a8087d7fde/3513863008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2cc822-a2c5-41e4-a392-60fca778af73/in_the_heart_of_the_night_movie.pdfIn PDF document text
    • https://zitatotifewe.files.wordpress.com/2020/11/89388487589.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://miloxujakube.files.wordpress.com/2020/11/liwozupes.pdfIn PDF document text
    • https://mafebono.files.wordpress.com/2020/11/brooklyn_dodgers_logo_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bd69b8-9a21-4804-944d-305dde647ffc/88045369799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac4f8c3-1d10-4c18-ae05-f46ba1ce6362/begasikesiligif.pdfIn PDF document text
    • https://zopovamodutu.files.wordpress.com/2020/11/45329342212.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195430f2-b170-4ec9-952f-b0b7d9bd40eb/using_method_of_joints_determine_the.pdfIn PDF document text
    • https://rewuvitosil180903676.files.wordpress.com/2020/11/xegabaripupofirebinolizug.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_off00006441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 5484 bytes
SHA-256: b05d414697f42968f5cc7123f5c536a3be15a6729ed5caafa1b75591501599cd
font_01_sfnt_off00007717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 9808 bytes
SHA-256: 6b8a93cf22a88ba6c74b293dc3e7316599fb64e6e9c3520a4f863dc641def0da

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