Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbe08fe00ee4f2f…

MALICIOUS

PDF

49.6 KB Created: 2020-10-30 04:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 061f08c7798b761061a0695c7098b88d SHA-1: 2f934440e5d10dc7356d08f05cdae5789d2e9c4a SHA-256: 9dbe08fe00ee4f2f1eab68ed885a9fd9e12ff2de7ae7920004f1a05bb097f838
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://ttraff.com/123?keyword=eacl+2020+proceedings In PDF document text
    • https://vixepakezo.weebly.com/uploads/1/3/4/4/134447938/2774795.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/d51009.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/7a471cc190.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/puguwamameg_wobij_kugenixexu_wawuxavijo.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/3036723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8735eaa535d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f924483377cb.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/5a7b27b1400268f.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/ce82c38c7339.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dadupawo/wosutajevilup.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/11890271919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf22208-8af6-4dea-8f08-d668daac12e7/73249042313.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/cambridge_dictionary_advanced_learners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f0fd37-56e3-46ba-a0aa-e4d614009c56/bafij.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/20833886110.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/gupilupinudowetimelag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72F3 5180 bytes
SHA-256: ee8cd13974b5209fdf9fc4718e577d03cc9edede4e2bb543974b24eba44d2db1
font_01_sfnt_off0000848c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 11648 bytes
SHA-256: 2903b7d019cc1759308b2c84b31820d8e86e38a73678be23d066470b69bcb4aa
font_02_sfnt_off0000ab50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB50 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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