Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24a366bfdaf3858…

MALICIOUS

PDF

44.7 KB Created: 2020-10-28 09:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a6b1d07e104b29f8a1c843526fd8539 SHA-1: 0ca0b748d196948a3e6c8e8cbe9c09a1d6326001 SHA-256: f24a366bfdaf38586b486e0bfd95973175d1d40eec88af9b11054aef1f4769ac
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with 30 external links, including a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/strik?keyword=mercedes+key+battery', suggesting a phishing or scam attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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 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.
  • 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://gettraff.ru/strik?keyword=mercedes+key+battery In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5f94525e6348e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_5f9719975ed01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f8cbd6caed0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8fc17d040bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f944bfbd3b45.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/baridujuxopix_kizabukoterirus_fejinidibuvegek_fununavuj.pdfIn PDF document text
    • https://pukejuzim.weebly.com/uploads/1/3/4/4/134457080/9411494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bawuxozamubagos.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/wubupijefe.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/70282400186.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/beginning_digital_electronics_through_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administrative_science_quarterly_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/loxemidure.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/add_text_box_to_acrobat.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/cengage_objective_physics_for_neet_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3665d1e0-7028-4a93-8ac8-26f8538e4284/bexovadupomugebamokiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765589c8-ee86-4ee8-b6fd-6e84f59d2924/piwimesaveninizaxito.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_off00006e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E00 5212 bytes
SHA-256: f690a46dc3f36c302504ab06e9e098ad9f4d7a594195df01c59d5bc27de5bb84
font_01_sfnt_off00007fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD6 11220 bytes
SHA-256: 618a2511170df8f1fd02e475028bb50b590188f8bf2ca7b3f65d9882cb5fd58f

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