Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d4eb5bbddcf60d…

MALICIOUS

PDF

35.9 KB Created: 2020-11-08 15:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 977e7cac85e324b25f27255d036e4608 SHA-1: dc00076995d95fd4d82ef04e85e7afd5a5eaff2e SHA-256: 09d4eb5bbddcf60dfd7b02445f8b6188ed3896ae66db534ec98d26377bd07f80
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary URL, https://trafffe.ru/123?keyword=unblocked+games+66+earn+to+die+exodus, suggests a lure related to search engine optimization or potentially malicious content disguised as game-related links. The ML classifier strongly indicated maliciousness, and the structure points towards a tactic to manipulate search results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=unblocked+games+66+earn+to+die+exodus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f9f8a7cc15f1.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://s3.amazonaws.com/faserubafa/35253653087.pdfIn PDF document text
    • https://dotipamedu.files.wordpress.com/2020/11/wukufezeg.pdfIn PDF document text
    • https://xepumup.files.wordpress.com/2020/11/camp_x_ray_full_movie_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b221775c-fdd2-4b9f-aefe-3416df19ad4d/felanaputemun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1830ec0b-2fe9-4333-a1f2-0602a8703e7c/zibubodatagumojuwurologu.pdfIn PDF document text
    • https://lusiwelop.files.wordpress.com/2020/11/37330451723.pdfIn PDF document text
    • https://zitatotifewe.files.wordpress.com/2020/11/28499819268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2becd0eb-c450-4897-acdc-8ffac68263e2/xapuwilituvoxut.pdfIn PDF document text
    • https://nafefof.files.wordpress.com/2020/11/after_all_chords.pdfIn PDF document text
    • https://xexagaze.files.wordpress.com/2020/11/bse_odisha_6th_class_book.pdfIn PDF document text
    • https://mukiwubira.files.wordpress.com/2020/11/planck_s_constant_experiment_viva_questions_with_answers.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_off00004e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E03 5676 bytes
SHA-256: 7786268baef8376297f61ca0ff7f71588a43f7c4ffc0c1d0a2c15d87eb0c10c7
font_01_sfnt_off0000613f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 9704 bytes
SHA-256: c92a31c9142b5c1396d37fb068d93bd427999b2f60ce88eefa40618a3c838531

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