Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3a527ae2bbde32…

MALICIOUS

PDF

64.0 KB Created: 2020-11-06 19:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4eb1c6f5f89b9896c7e256aa2cf103b6 SHA-1: da1bbff99fb021664a683ef6c3f7552e91d8fa4e SHA-256: 9c3a527ae2bbde323ff5ea48c643553f36210acbd357bd41753b22fe155e4a5f
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://traffmen.ru/123?keyword=2nd+gen+4runner+manual+transmission+swap In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f8ee8c36654e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca987582-f5cc-4f9a-a339-afc6fd029d20/domisitisubegumulenegag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab841b4-6e2b-4c9e-9120-f7317a1d09d5/36011292835.pdfIn PDF document text
    • https://zususenotad.files.wordpress.com/2020/11/apocrypha_new_testament.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/phantom_warrior_dnd_5e.pdfIn PDF document text
    • https://dufakeribeze.files.wordpress.com/2020/11/20778825530.pdfIn PDF document text
    • https://kiwowet.files.wordpress.com/2020/11/39347431181.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/knee_injury_rehabilitation_exercises.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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 5496 bytes
SHA-256: 8e9affd71d60e18d1114d3bb65daeddc4729dcfe7c1fbfa49b36ee01e63dcd34
font_01_sfnt_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 10836 bytes
SHA-256: 88e42379cc3c98f19784f7056902c17ff3316f8e138fe33fc430feffd2573009

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