Malicious PDF — malware analysis report

Static analysis result for SHA-256 03342e4bbcc8c69a…

MALICIOUS

PDF

40.5 KB Created: 2020-10-27 18:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3865b1eb54c3b2434d48e5ce63bbab56 SHA-1: 2411ff9121a518e4fdd1756aa33898de94fcee6c SHA-256: 03342e4bbcc8c69ada6a01c65812c4bc989aae995944d4b499dae5a0562b460b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=7th+grade+homework', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The presence of numerous other PDF links further indicates a link farm or redirection strategy. 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://cctraff.ru/strik?keyword=7th+grade+homework In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f8dbdfe160a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f9669c415b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5f9297b6b3853.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/jadere/anemia_perniciosa_diagnostico.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/bozajubo.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/business_letter_test.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/weight_lifting_for_weight_loss_female_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/aegon_religare_iterm_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1748/6503/files/super_smash_flash_2_unblocked_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/2020_toyota_tacoma_manual_transmission_fluid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9629/6612/files/2472128673.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/mht_cet_hall_ticket_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/zuzum.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/how_i_treat_aplastic_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/47078210808.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/vuvavujefazev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/tamepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/13_reasons_why_season_3_episode_guide.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_off00005e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0E 5172 bytes
SHA-256: 9951384b5aea74f20f0ba9375539aba58ecb03766931332810a7a8bc923ed5ce
font_01_sfnt_off00006f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 11592 bytes
SHA-256: b8ddd66283bcca84fa400219f6a873a7ea1013f7381c08692c199fdf91337c91

Open this report in the interactive analyzer, or submit your own file for analysis.