Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1c4314486ac62…

MALICIOUS

PDF

37.0 KB Created: 2020-08-06 18:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ce6f27040765f017849078c3d85dd9 SHA-1: 1e43f29df0f20d0565066816b89fec1d6a05759b SHA-256: 84e1c4314486ac62886983e2b5a5580254a56945c1b614b8010ce36fda057819
154 Risk Score

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 PDF files, suggesting an SEO link farm. One prominent link redirects to `https://ttraff.com/wb?keyword=physiology%20gk%20pal%20pdf%20download`, which is flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, reinforcing the lure.

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.com/wb?keyword=physiology%20gk%20pal%20pdf%20download
    • http://files.bruecherfoundation.com/uploads/1/3/0/8/130814340/xatex-nuworavogavi-temadakop.pdf
    • http://files.wwwwilsonsconsultancy.com/uploads/1/3/2/7/132712451/2014226.pdf
    • http://files.shelleyartgroup.com/uploads/1/3/1/3/131380901/tifisifizasoz.pdf
    • http://files.ericasclassroom.com/uploads/1/3/0/7/130738700/d6a84389fd975.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1778/1927/files/katuxuzakumetusunizos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/62749831569.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/98835986786.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1892/files/malachi_martin_the_jesuits.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7266/files/serial_office_para_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/wordly_wise_3000_book_5_lesson_13.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/22449273921.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7974/files/55310196019.pdf
    • https://cdn.shopify.com/s/files/1/0435/8527/4024/files/37409530612.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/nidamukodukerebuvitowavop.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/nuwujipanokiwisuja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045bc.bin
68e4b76951541cca742c1798cc8a042db7627d44bf418a422718ae38326c2e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45BC 5056 bytes
font_01_sfnt_off000056ef.bin
181a767c1fd290fba6c00c54e2cb8f629fbd3158f0fa728999e1d7497fd0399b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EF 9540 bytes
font_02_sfnt_off00007776.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7776 4324 bytes

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