Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f4799418eca76…

MALICIOUS

PDF

49.1 KB Created: 2020-08-22 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 739a861982e00fc3332c9b44c84cee65 SHA-1: 89f91873ddc68aa7259359132c1976da46aca552 SHA-256: 181f4799418eca76ed5e1896b8397930f244c0cbaefa7db67f8eb408ab964e49
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior with numerous external links, many hosted on Shopify. While no scripts were extracted, the presence of malicious redirector links and a large number of external links suggests an attempt to lure users to malicious content or for SEO manipulation, likely delivered as a spearphishing attachment.

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.ru/pify?keyword=devexpress+wpf+grid+column+template+selector
    • http://mirufibe.mennigen-lab.com/uploads/1/3/2/6/132681670/retazusaniw-dajageri-fibodujevuse-lopipizujevun.pdf
    • http://files.2018flyballnationals.org/uploads/1/3/0/7/130776268/kidipu-pevexutitumixo-zidelusowav-dugomuremere.pdf
    • http://files.newtesting.org/uploads/1/3/0/7/130775310/vejazag_xurabelo_topizivuwu_duzudaponukuvo.pdf
    • http://files.drivingaids.com/uploads/1/3/1/3/131383247/5e98c7f37ab4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/gabimezijikifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9617/files/nomenclature_of_alcohols.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/wuferuxuvafiragoguf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/quizlet_hack_extension.pdf
    • https://cdn.shopify.com/s/files/1/0431/5938/8320/files/refov.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/baumer_ch_8501_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/employment_equity_committee_member_appointment_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4005/files/59149193905.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/basic_technical_drawing_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/wogunutetivuluvugipiguza.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9843/files/mujunoxubedogij.pdf
    • https://cdn.shopify.com/s/files/1/0440/6208/1174/files/plenty_of_fish_paid_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/cxc_biology_past_papers_and_answers.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_off000075a6.bin
97319645f017a66a74bf7fce928ce4441d6f3a153bca1a7808a133361901696b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 5692 bytes
font_01_sfnt_off00008904.bin
3000eec997fc6ba3b39e2143a43f72163b378539450b00cb69f3f99fcb2529e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8904 14968 bytes

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