Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b4cb3f7674766c…

MALICIOUS

PDF

41.1 KB Created: 2020-10-20 17:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a4d7121f72cbdf9b62b3831e3c90faee SHA-1: fcbfdfc2be2272d5b336b2114a7e4ee8895b5c3a SHA-256: 38b4cb3f7674766cb3d28b473df1f3cd2747e3215beeda57894a29024f7c47c1
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?keyword=tp+diffraction+ts'. The document body also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, identified as a link farm, further supports a malicious intent to redirect users. No scripts were extracted, but the embedded URL is the main indicator of compromise.

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://cctraff.ru/strik?keyword=tp+diffraction+ts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8e80be4bd75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8714a65a9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f8eb84d12225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8bedc3412e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8743e3591d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f8a7743d97f8.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/1/0497/3232/1431/files/12746395455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3097/7431/files/65209859948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5023/7604/files/class_12_chemistry_practical_book_ncert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/7217/6295/files/10729473146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/top_strategy_games_2020_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5656/1059/files/famebejirek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3251/8049/files/42924522556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1498/8198/files/13161089212.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4816/3738/files/korijuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2407/5928/files/gujuguwatosovubupiduve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/bujuvilifagajezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/vexogaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1042/8575/files/atlas_of_medical_histology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9669/7768/files/jinage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/life_after_apk_obb_english.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_off0000618e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 5064 bytes
SHA-256: aac7f68100b0327997b8824ea17d4eb0434a6e114b537ef6e8ae1d13801f5f85
font_01_sfnt_off000072d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D1 10420 bytes
SHA-256: 2fd01de9a7db67f7305e8bbf83d1557e77c2bf995874f5e8b9fb3680e3ca39a0

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