Malicious PDF — malware analysis report

Static analysis result for SHA-256 084e8fef78746512…

MALICIOUS

PDF

72.8 KB Created: 2020-08-12 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe73de1063ec5589083808d30f9fb64 SHA-1: 715cefdb65ed8a08aefc1966ef33bca245900d95 SHA-256: 084e8fef787465124947097c99e849750b60ba9a8982373970b925c89f99e785
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on various domains. One of these links, however, redirects to a known malicious redirector URL (ttraff.cc). This suggests the document is part of a link farm or a phishing campaign designed to lure users to malicious content. 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://ttraff.cc/wb?keyword=group%20inhibition%20of%20bystander%20intervention%20in%20emergencies%20pdf
    • http://files.volunteerteachkenya.net/uploads/1/3/1/4/131455832/sexug_felizoso_risibumulifomat_padovalodobuz.pdf
    • http://files.cleftstrong5k.com/uploads/1/3/0/8/130813526/wugelojuzitevip.pdf
    • http://majebos.centennialcarpetsinc.net/uploads/1/3/0/7/130739963/tomedelekik_wumin.pdf
    • http://wefumu.highperformanceresumes.com/uploads/1/3/2/3/132303382/8f9b9ca43df9d.pdf
    • http://files.elvendonimages.net/uploads/1/3/0/7/130775490/xabopeloxokoz_jegunezag_gekosuxorupalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1388/8424/files/57415595072.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/36600548963.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/natupeli.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/fajalufurigatabikuliso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/junior_assistant_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/9483955586.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/believe_in_miracles_but_trust_in_jesus.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/is_g_suite_hipaa_compliant.pdf
    • https://cdn.shopify.com/s/files/1/0432/2063/1720/files/54251996617.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/81973193705.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4611/files/acls_algorithm_american_heart_association.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/abrsm_piano_grade_5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd51.bin
7ec288368e4d777a917d2c31edfc2b6d79d2366fd29c15696c0c5fb4e04c467a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 5868 bytes
font_01_sfnt_off0000f12f.bin
9f1dc1e5025931b1ee419bd620f1aa21e6a1fe9e79fc8b6f16322b1219005529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10504 bytes

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