Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee8e8778360c33…

MALICIOUS

PDF

45.6 KB Created: 2020-11-03 02:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f0f8efa3d89f3bb4044b7064f49f805 SHA-1: 9423a9cdc3e893f8fd7241ffc18acaa11606d143 SHA-256: e1ee8e8778360c33b16ef7d8fa20e8a062091707c54fb3cd2e29f1e5a4b658fb
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, a technique often used for SEO manipulation or to obscure malicious redirects. One such link, https://gettraff.ru/strik?keyword=married+chat+apps, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links and the malicious redirector suggest an attempt to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=married+chat+apps In PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/wofaburur.pdfIn PDF document text
    • https://rasagarus.weebly.com/uploads/1/3/4/4/134452949/189206b0dc18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2687/7080/files/45097020613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d3ba52-0f0d-4932-a988-1e042a8a36c9/gabigoliwosam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2296/9764/files/first_person_tetris_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/midpoint_and_distance_formula_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/dark_souls_timeline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/50190593063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/sports_marketing_journal_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/european_languages_word_whizzle_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3185/5772/files/23188915704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8446/2274/files/wasaxumasirojizudube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4966/3654/files/d15b7_crate_engine_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/black_sunday_storyworks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce88c9ac-d0be-4195-95b9-80393f48611f/ninalivoboxovup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8720/2971/files/rubijuvuluvenifadufijut.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_off00007216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 5132 bytes
SHA-256: 8baa7c6262fab6c56be1c9e8956fc60ffa4674a758d508d948bff0e5c38857ad
font_01_sfnt_off0000838c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838C 11212 bytes
SHA-256: 13aac9d6f90d9c20427f9d5dda2f33a974625aa1ee85db83dfd14ed608c8dbc2

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